.45 GAP – The Cartridge That SHOULD Have Replaced .45 ACP

Courtesy – Federal Premium

The .45 GLOCK Auto Pistol cartridge, otherwise commonly known as the .45 GAP, was and is still a very viable cartridge for the 21st Century.

It was developed by Ernest Durham, of CCI/Speer in November 2002 at the request of GLOCK to have a cartridge that’s the same overall length as a 9x19mm cartridge, but be equal in power to a .45 ACP cartridge. It was introduced to the shooting world in 2003 to much fanfare and support from a number of industry writers and critics.

Speer originally released the cartridge in a Gold Dot defensive load where a 200gr JHP round was pushed out at 1,050 ft/sec and delivered about 490 ft-lbs in energy. That load replicated the +P .45 ACP loads that Speer was making at the time.

.45 GAP - The Cartridge That SHOULD Have Replaced .45 ACP

Courtesy – Speer Ammunition

They later released the cartridge in a 230gr load that achieved 935 ft/sec and delivered 445 ft-lbs of energy. That’s similar to other non +P .45 ACP loads.

GLOCK, of course, offered standard, compact, and sub-compact-sized pistol chambered for the round. The frames were the same size as their 9mm/.40 S&W counterparts and though the slide was slightly wider. The .45 GAP chambered guns fit in most holsters made for the lesser diameter pistols.

The GLOCK 37 was, of course, the full-size duty pistol. Having a total capacity of 10+1 rounds. It served well with five big law enforcement agencies; the Florida Highway Patrol, Georgia State Patrol, South Carolina Highway Patrol, New York State Police, and Pennsylvania State Police.

Smaller county and city agencies issued .45 GAP GLOCKs, too. Agencies like the Melbourne (FL) Police Department, Burden (KS) Police Department, Greenville (NC) Police Department, the Berkeley (MO) Police Department, and others.

.45 GAP - The Cartridge That SHOULD Have Replaced .45 ACP

Courtesy – GLOCK

I carried a G37 during my career as a uniform patrol officer and actually enjoyed it. At no point did I ever feel under-armed. With a total of 41 rounds on me plus a backup Smith & Wesson 642, I think I did pretty well.

Shooting it was a hoot. It was smooth and comfortable, exhibited little recoil and no snappiness. Prior to the G37, I was issued a G22 in .40 S&W and I found both to be equals. I love the .40 S&W.

Both .45 GAP and .40 S&W are great cartridges that are highly misunderstood. They’re fantastic duty cartridges and do the right job for their intended tasks.

Other manufacturers got on board and chambered guns in .45 GAP, too. HS Produkt, the manufacturer of the Springfield XD (HS2000) offered it for a period of time. It was marketed and marked as the Springfield Armory XD-45LE.

.45 GAP - The Cartridge That SHOULD Have Replaced .45 ACP

Courtesy – Springfield Armory

It came with 13-round capacity magazines and had the option of a 4-inch or 5-inch barrel.

Other than the G37, GLOCK also made the G38 with an 8-round capacity and little G39 with a 6-round capacity.

.45 GAP - The Cartridge That SHOULD Have Replaced .45 ACP

Courtesy – GLOCK

So, while it may repulse many in the gun community, I’m an enthusiastic defender of the .45 GAP round. Yes, you read that right. I’m defending the cartridge and openly stating that I like it.

The .45 GAP is what should have replaced the .45 ACP industry wide. By comparison, the .45 ACP is outdated and a waste of space. The cartridge dates from a bygone era of black powder and horse-mounted cavalry attacking infantry with sabers.

.45 GAP - The Cartridge That SHOULD Have Replaced .45 ACP

.45 GAP (left) next to .45 ACP (right) Courtesy – quora.com

Why carry a cartridge that’s outdated, wastes space and makes the gun unnecessarily bigger when you can carry a smaller cartridge and gun that achieves the same power? It isn’t logical, and you know things had gone a little differently, you’d be carrying a gun chambered in .45 GAP right now.

The .45 GAP simply was released in the wrong era. The cartridge was GLOCK hedging its bets that the 1994 Clinton “assault weapons” ban would be permanently renewed by President George W. Bush. It’s no coincidence that the full-size G37 holds 10 rounds.

During the ban, GLOCK did very well selling their pistols for a few reasons. One was they had a great marketing strategy. Get as many of them out into police holsters and on both the big and small screens. Back before the AWB came into effect, they would go to a police department and allow the agency to trade in their old stock of guns and magazines, even if they were a competitor’s product. Why? Because they’d flip the guns and mags on the used market.

When the AWB kicked in, it was the dawn of the era of the .40 S&W and agencies left and right were trading in their Wondernines for the hot new caliber. GLOCK did the same thing with their own stock of 9mm pistols. They’d go to an agency and swap the older pre-ban Gen1 and Gen2 9mm guns and mags for brand new .40 S&W G22s. They’d then take those used, but still very valuable pre-ban magazines and sell them for a good price.

By the start of the 21st Century, they figured the supply of pre-ban mags would start to decline. Brand new full-size 9mm and .40 S&W guns weren’t going to sell as well when the buyer couldn’t get 15-round or 17-round magazines for their new gun. Why buy and carry a 10-round limited G17 or G22 when a 10-round G37 made more sense.

That’s why the popularity of the 1911 was resuscitated after the AWB was signed into law. Suddenly having a 8-round single-stack 1911 made more sense because it was “thinner” and “had more knockdown power.” A 10-round .45 GAP G37 made even better sense since you could pack more ammo than a 1911, it was the same size and weight as a G17, but you still get the capabilities of the .45 ACP in an overall better package.

If the .45 GAP has been released when the .40 S&W came out (January, 1991), it would have taken the LE and civilian market by storm. The GLOCK 21 was released the prior year and the biggest complaint was that the frame was too big (it sold well anyway).

Everyone wanted a pistol that was just as capable as .45 ACP pistols, but in an overall smaller size. The same complaints were made about the SIG P220, S&W 4506, and Ruger P90. They were big guns. That’s what led to the huge popularity of .40 S&W. It gave the shooter more power than a 9mm, but still fit in a 9mm framed gun.

If the .45 GAP had come about then, everyone would have jumped on board because it would have duplicated or bettered the .45ACP. Agencies like the Federal Bureau of Investigations, California Highway Patrol, US Border Patrol, City of Miami Police Department, and other big .40 S&W adopters might have gone with the .45 GAP instead.

.45 GAP - The Cartridge That SHOULD Have Replaced .45 ACP

Courtesy – Remington Arms Co.

Again, I carried a .45 GAP G37 for a while during my career as a beat cop. I truly loved the gun and the chambering. I’m on the hunt for an affordably priced G37 right now. I still have about 500 rounds of the Speer 200gr Gold Dot and I have it all on moon clips for my S&W Model 625. Yeah, they work great in .45 ACP chambered revolvers. It’s a hell of a self-defense cartridge.

So please stop looking down on the .45 GAP. It was a great idea released at the wrong time. It was a commercial flop not because it was an answer to a question no one asked, or because it wasn’t effective. It flopped because the market dynamics that would have benefited it changed.

The AWB ended (that was clearly a good thing), the majority of the market could buy full-capacity 9mm magazines again, and the evolution of ammunition benefited the popularity of the 9mm. But in truth, the .45 GAP was a very good idea that just didn’t catch on.


  1. avatar strych9 says:

    I dunno. Equivalent to a +P .45ACP but without a manual safety on the boolit? Sounds pretty sketchy to me.

    The only thing worse than Glock Leg is G.A.P. Leg because GAP jeans suck.

    1. avatar DapperGunsmith says:

      I read the article and I’m like “wtf”, then I get down to the comment section and read this so obviously I’m still like “wtf”. Wtf is going on here?

        1. avatar Danny Griffin says:

          gif set to private?

      1. avatar strych9 says:

        It’s a joke. Probably a bad one.

    2. avatar Gadsden Flag says:

      I remember when .45 GAP came out. Seems like a 180 grain was standard then. I was at the SHOT Show telling Glock they needed a full size single stack .45 ACP. The rep laid a 36 on the counter. Got one and I said full size. Then he proudly laid a 37 on the counter. ? He explained. Sigh! We don’t need a new caliber. You need a new pistol in an already proven caliber. He glanced around to insure he wasn’t being overheard. Then said, “Gaston Glock just wanted his name on a cartridge.” Fast forward. Talking to an FHP Trooper who is on the board to select a replacement for their Berettas. He’s extolling the virtues of the Glock in .45 GAP. I said, “That’s a mistake.” He took umbridge. I said, “You’re not going to be able to get ammo.” He didn’t believe me. I told him, “Ammo manufacturers load the most popular ammo first. It ain’t .45 GAP. Fast forward again. Bump into him again at a scene. “How’s that .45 GAP working out for you?” With a whine in his voice, “We can’t get ammo!” Is this the part when I get to say, “I told you so.” The ammo availability may have improved, but it’s still just a cartridge we didn’t need who’s purpose seems to have been to massage an ego.

      1. avatar Gadsden Flag says:

        Luis, one more thing. Don’t believe .45 ACP was ever loaded with black powder. Perhaps you’re thinking of .45 Colt developed for the Colt SAA?

        1. avatar Specialist38 says:

          You mean 45 Loooong Colt. Don’t you?

        2. avatar Gadsden Flag says:

          Nope. The cartridge designation is .45 Colt. I believe people began calling it .45 Long Colt to differentiate it from .45 Schofield. Anyway, my Colt SAAs are marked .45 Colt. No long in there anywhere.

        3. avatar Specialist38 says:

          Right. That’s why I extended the “long”. It was sarcasm.

          But folks call it long Colt anyway…. I guess because it’s more endearing than just plain old 45 colt.

        4. avatar ken says:

          He didn’t say it was “loaded” with black powder. He only said it came from that era.

        5. avatar BR says:

          Gasden Flag above is right. It is .45 Colt and .45 Schofield.

          Anyways .45 Automatic Colt Pistol was designed to match the ballistics of .45 Colt then in black powder but fit in a automatic pistol. -Think about it, a .44/.45 cap and ball revolver pushes a 180 grain conical chunk of lead at about 850-1000 fps, basically what a .45acp does albiet modern bullet and powder tech has shoved it beyond what black powder could accomplish.

        6. avatar Kenneth Stephens says:

          9mm came from the same era as the 45acp though. It’s actually a few years older than 45acp. If 45acp is outdated, then so is 9mm.

    3. avatar Trump Rocks says:

      First 45Gap failed because no one else felt the 45 was dead. 2nd NY State Police went to the 45Gap because female troopers and smaller males with small hands wouldnt pass Q course with glock 21 or 1911. Same goes for FBI. Going back to 9mm because ivory league rookie agents couldnt pass Q course with glock 23 g27.

  2. avatar barnbwt says:

    The typical 45 shooter has a “I’m a big kid, and I want a biiiiiig cereal” attitude toward firearms (specifically the grip). They don’t tend to like new things.

    1. avatar Sgt of Marines says:

      I shoot a .45ACP and do so because it was the first pistol I was trained on , I mastered it liked it and I still do. Not a big kid and no biiing cereal here.

    2. avatar DJ in FL says:

      .45’s big. Yeah! Yeah! Yeah!

      1. avatar Rad Man says:

        Big big bullet in a big big case!

        1. avatar Mark says:

          You skipped the second line: It’s not small…no, no, no!

        2. avatar Jeff in CO says:

          I just carry a .500 S&W concealed in an ankle rig…

    3. avatar Gadsden says:

      And the typical 9 shooter has weak, feminine wrists. See how that works?

  3. avatar Andrew Lias says:

    I’ve gotta say am I the only one that thinks the G39 doesn’t make any sense since for roughly the same size I’d carry a .357 magnum with similar or the same capacity?

    Technologically good doesn’t mean feasible in the market or philosophically a good idea. .45 GAP was a solution in search of a problem and released with somewhat sketchy timing.

    I think most people would either size down guns instead of a 10+1 full size gun .45 GAP or size up to a bigger round such as 10mm or .357 magnum. Not just that but no body wants to go hunting for niche ammo. A department supplying it is one thing, paying for it yourself is another. Then again the departments have been cutting to 9mm precisely because they don’t want to pay for it either.

    1. avatar California Richard says:

      Let the FBI speak for itself:
      “-Most of what is “common knowledge” with ammunition and its effects on the human target are rooted in myth and folklore.
      -9mm Luger now offers select projectiles which are, under identical testing conditions, I outperforming most of the premium line .40 S&W and .45 Auto projectiles tested by the FBI
      -9mm Luger offers higher magazine capacities, less recoil, lower cost (both in ammunition and wear on the weapons) and higher functional reliability rates (in FBI weapons).”

      The FBI outlines quite a few more reasons but the above is the long-and-short of it. Here’s the full list from the FBI:


      1. avatar Gadsden Flag says:

        Is that the same FBI that decided the 9mm lacked penetration and wound channel diameter back in the ’80s? Sure, bullet performance has improved since then. Across the board for all calibers. With handguns the not so secret secret is; bigger, deeper holes. Agencies are going back to 9mm because of the bean counters. Nine is less expensive, not necessarily better

        1. avatar Anymouse says:

          One of the problems with Miami was that they were using 80’s fast opening 115gr 9mm Silvertips, which didn’t penetrate well. New 9mm is 124-147gr with bonded jackets. The other change is picking ammo based on penetration performance instead of energy.

        2. avatar California Richard says:

          FBI/USDOJ isn’t shy about spending YOUR money, bean counters be damned. 30+ years of hard data has put to rest the FBI’s assumptions about handgun caliber (human) terminal ballistics.

        3. avatar Specialist38 says:

          The biggest problem in Miami was poor tactics and an opponent with a rifle.

          They decided one of the “hits” on the bad guy would have stopped him if it had penetrated deeper across his torso.

          They made the best of a bad situation and the effect was dismal.

          Getting into a gunfight after you crash vehicles has got to be one of the biggest “oh shit” moments you can have.

  4. avatar Cloudbuster says:

    “Gretchen, stop trying to make ‘fetch’ happen! It’s not going to happen!”

    1. avatar Jon in CO says:

      Well played. I think this will be lost on the OFWG here, though.

      1. avatar Specialist38 says:

        Cause were not teenaged girls.

        1. avatar Geoff "I'm getting too old for this shit" PR says:

          “Cause were not teenaged girls.”

          “Teenage girls – they make us want to shout
          Teenage girls – trying to wear us out
          Teenage girls – they get so tan
          Teenage girls – make you feel like a man”

        2. avatar strych9 says:

          Witty. You mean bastard.


    2. avatar Rad Man says:

      45 GAP is so gay it can barely function.

      1. avatar Red in CO says:

        Lol wonder how many here get that reference

        1. avatar Danny Griffin says:

          Some poster here is overly interested in homosexuality?

    3. avatar Rusty Chains says:

      does this mean you are planning to get run over by a bus?

      1. avatar Cloudbuster says:

        Situational awareness!

    4. avatar strych9 says:

      I’ll take “Movie references that confuse and confound older people” for $400.

  5. avatar Tom of Toms says:

    Lower pressures. .45 ACP operates at lower pressures (more enjoyable to shoot) and can be loaded to higher pressures depending on the brass and purpose. AOTE, .45 ACP is still more versatile and anyone who likes reloading isn’t changing over.

    1. avatar Whoopie says:

      Ya got me to thinking, wasn’t this about the time Glock .45s were suffering kabooms because the chambers didn’t fully support the casing?

  6. avatar tdiinva says:

    If 45 GAP does the same thing as 45 Auto then the only purpose it serves is to lock you into a Glock pistol. Proprietary products generally fail in the market place. The only way that would have created a market for 45 GAP is if Glock vacated its trademark rights.

    1. avatar Luis Valdes says:

      You mean like what Colt did back in 1905 with the .45 ACP?

      1. avatar Sgt of Marines says:

        You are not actually comparing the firearms environment of 1905 to today are you???

        1. avatar Specialist38 says:

          Only the players have changed.

        2. avatar Gadsden Flag says:

          Why not compare them? I’ll take a 1908 Colt over most Tuberware pistols today. No, wait, I’ll take a 1908 Colt over all Tuberware pistols today. Or a Walther. Or any number of firearms that were not only tools, but works of art. “They don’t make ’em like that anymore.”🎵

        3. avatar Geoff "I'm getting too old for this shit" PR says:

          “No, wait, I’ll take a 1908 Colt over all Tuberware pistols today.”

          Where are the 30 round magazines for that 1908 Colt?

        4. avatar Gadsden Flag says:

          Geoff, who needs a 30 rd. magazine in a pistol? I mean, I spent an afternoon on the range with a Glock 18 and a 33 rd. mag., but that was full auto with a very high cyclic rate. I guess I have a couple of “high capacity” pistols. A Beretta 92. I know. I apologize. And a Browning Hi-Power worked over by Wayne Novak. Carried the Browning a few times, but never the Beretta. Otherwise, never carried a handgun that held over nine rds. including the one in the pipe. Always had at least one reload though.

      2. avatar Specialist38 says:

        Done before that. Smith and Wesson introduced the 38 Smith and Wesson Special.

        158 grain roundnosed bullet.

        Colt responded with 38 Colt Special with sharp-shouldered bullet.

        Gotta be thinking to protect those trademarks.

        There is not much new under the sun.

      3. avatar tdiinva says:

        Colt kind of had a near monopoly in the US automatic pistol market in the first decade of the 20th Century. Glock not so much 100 years later.

      4. avatar TruthTellers says:

        This comment explains it all. Look, I get it: you’re a fanboy for the latest fad and hate the old guys at the range who make the .45 ACP sound like the fist of God. The first decade of the 20th Century was a time where smokeless powder was replacing black powder and new, rimless automatic cartridges were being made. The Army demanded a new pistol that mimicked the ballistics of the .45 Schofield, so a 230 FMJ at 800+ fps was the result.

        I don’t hate the GAP, but because ACP is so popular, I can grab ammo for it on sale for half the price of GAP ammo. As such, I have no need or desire for a pistol in GAP.

        1. avatar Gadsden Flag says:

          To be fair .45 ACP may not be the “fist of God,” but he does carry an M-1 rifle and a 1911. Well, on a slow day he might carry an ’03.

        2. avatar jwm says:

          I thought the ‘fist of God’ was Chuck Norris.

        3. avatar Gov. William J Le Petomane says:

          I’ve personally met the fist of God and I can tell you his name tag said, ‘Hello my name is; .44 Magnum’.

    2. avatar TX223 says:

      You’re absolutely correct, and the open market strategy of the 6.5 Grendel, 300 BLK, 224 Valkyrie, 6.5 Creedmore and others are proof of that.
      The 300 Whisper/300BLK, and 6.5 Grendel are particularly good examples since the demand for each took off once the open market SAAMI specs were released.

      1. avatar Anymouse says:

        Grendel and Beowulf aren’t open market. The specs are standardized and published, but you need to license them from Alexander Arms.

        1. avatar Erik Weisz says:

          Or you can get .264 LBC (Les Baer Custom), which is exactly the same as 6.5 Grendel, without the licensing requirements. At least that used to be the case, I believe Alexander Arms has actually released both Grendel and Beowulf specs without licensing requirements. I still see a few barrels marked and made in .264 LBC, though (Black Hole comes to mind).

  7. avatar No one of consequence says:

    Or, put another way, Glock was feeling too lazy to make a few dimensions a few mm longer … or being too dreamy about a potential locked-in customer base. Other than that it’s just not different enough than old-style .45ACP in terms of size or achievable peformance. All the gun rag enthusiasm tells me is they tried hard to please their advertisers then, too.

    If you had one and liked it, good for you. I really like shooting .22TCM but that doesn’t make either one of them a guaranteed success.

    If you want to talk about an underrated cartridge let’s talk about .357 SIG.

    1. avatar TruthTellers says:

      .357 Sig has everything going for it on paper and if the Army or Marines would adopt it, it would take off in the civilian market as ammo price and availability would improve. As it stands now tho, it’s a PITA to reload cuz of the bottleneck and isn’t as powerful as 10mm and not so much more effective than .40 or a hot 9mm on a person to warrant using for defense use.

      1. avatar Erik Weisz says:

        Another good point for the .357 Sig is you can take a 9mm barrel, re-bore it for .357 Sig, and stick it in a .40 slide and you can even use the same mags. You get more power than a 9mm/.40 in the same size frame without a lot of effort or expense and can swap back to your 9mm or .40 at will.
        If I was gonna go all out, it would def be to 9×25 Dillon, though, or 7.5 FK if $$ was no object – those two are the ultimate pistol rounds, IMO.

  8. avatar pwrserge says:

    Meh… There’s nothing that a .45 cartridge can do that 10mm or 9mm can’t do better. If somebody made a decent retention holster for a Glock 40, that’d be my EDC instead of my 34.

    In short…
    10mm is still the best mm.
    9mm does everything you need from a handgun with modern ammunition and doesn’t cause your magazines to weigh more than your pistol.

    1. avatar Gov. William J Le Petomane says:

      ’10mm is still the best mm.’

      Well… if you simply must carry a semi-auto pistol…

      1. avatar Erik Weisz says:

        .50 GI

        1. avatar GH says:

          .50 GI puts out markedly less energy than 10mm

  9. avatar rosignol says:

    Why carry a cartridge that’s outdated, wastes space and makes the gun unnecessarily bigger when you can carry a smaller cartridge and gun that achieves the same power?

    Apparently my hands are bigger than yours, so I don’t see any significant ergonomic benefit from shrinking the grip.

    If I want to step up to a modern spec, I’d rather upgrade to 45 Super.

    1. avatar Erik Weisz says:

      What’s .45 Super, precious?

  10. avatar Ranger Rick says:

    Could of, would of, should of, but didn’t, so Luis your point is…..

  11. avatar Mark N. says:

    Should have replaced .45 ACP? Maybe. Ever will? Never. Too many millions of .45 ACP handguns out there for anyone to be truly interested in abandoning one for the other. The .357 Sig is another marketing failure.

    I also take issue with the claim that “the cartridge dates from a bygone era of black powder and horse-mounted cavalry attacking infantry with sabers.” Umm, NOT. The Colt .45 “Peacemaker” was developed in the balck powder era and specifically for hoorse mounted cavalry chasing Indians. The .45 ACP didn’t come along until 1905 and was smokeless out of the gate. By then, the end of the cavalry era charging the enemy was all but over.

    1. avatar Luis Valdes says:

      The .45 ACP was purposely developed to replicate the M1887 .45 Round Ball load after the failure of the .38 Long Colt in the Philippines. US Cavalry was still horse mounted, sabers were still a thing (to the point that George S. Patton designed the M1913 Cavalry Saber).

      When we developed and adopted the 1911 pistol, we were still a frontier army with the mindset of fighting wars of colonization and conquest. We were more worried of horse-mounted bandits and plains indians. We wanted a pistol that could put a horse or its rider down. Much like the British Army before WWI, our mindset and tempo was setup for colonial affairs. Not fighting major near peer powers. And even then, we still thought that the saber was a useful to for that engagement. We still had a lot of veterans from the Civil War that held an ear or two in the War Department.

      Hell, we had horse mounted cavalry engage Japanese Forces in WWII during the First Philippines Campaign.

      1. avatar tdiinva says:

        You are both wrong altough from technical standpoint Mark is correct . The.US Army never had traditional European cavalry. They were technically Dragoons aka mounted infantry. In fact by mid Civil War they were probably the wotld’s most effective infantry force equiped with a mix of single shot and repeating breach loaders. The only time Cavalry fought mounted was against other mounted forces. If confronted by infantry like Buford at Gettysburg, the troops dismounted and went to ground.

        1. avatar tdiinva says:

          Minor clarification. For the most part the Cavalry would only fight a mounted action if they no opportunity to dismount in favorable terrain.

      2. avatar Mark N. says:

        By 1911 the Indian Wars were long over. And the .45 ACP was then and still is a smokeless cartridge. Yes, Patton designed the 1913 saber–which is a long stabby thing not a slashing thing as they had been in the past. (Straight blades are effective in the thrust, curved blades in the slash.) It was, in short, a rather long bayonet, and it was only usable on foot or in a charge against other cavalry. If you look into it, soldiers were to be taught to stand in their stirrups and hold the blade fully extended in front of them with a locked wrist, with the intent to run through opposing soldiers. Soldiers were not to be encouraged, nor for that matter taught, how to cut and slash or to defend themselves from the opponents’ blades. The purpose of cavalry was to have the ability to move troops rapidly around on the battlefield and for scouting. Charges were a thing of the past (as the Poles learned the hard way) because they were entirely ineffective against machine guns. Bullets do, of course, move much faster than horses.

        1. avatar tdiinva says:

          That’s a myth about the Poles. They caught the German infantry off guard and overran them. They got caught by a German force moving up in support of the infantry while they were disorganized after their charge

        2. avatar Joe in San Antonio says:

          Traditional cavalry started going out of fashion when a young man from Corsica showed the world the power of field artillary. The French cavalry were primarily used to pursue fleeing Soldiers or when opposing infantry had broken from their squares. The US was never rich enough to invest in cavalry, as noted above the dragoon a mix between cavalry and infantry was much more our style, fitted our terrain and tactics better too.

      3. avatar ozzallos says:

        I still want a caliber that can put a horse down 🙂
        Oh, I EDC a 1911.

  12. avatar Specialist38 says:

    Sorry Luis….not buying it. I think GAP is an ok cartridge.

    You seem to be discounting the whole “FBI says we gotta have a bigger bullet” boondoggle. That led to the 10 which was too much goodness for the rank and file officer to handle. So they down-loaded it to pud ballistics and folks said “the pistols are too big for those small hands”.

    This led to Smith and Wesson’s development of the 40 to keep from losing the FBI contract. Smart move for them.

    So Glock gets some contracts for their 45 ACP but lose decisions because of the grip size and the number of officers hired with little, tiny baby hands. So they come up with GAP since they know their smaller-framed service pistols won’t blow with 40 cal pressures.

    And unless you can quote Glock rep thinking on the mag size limits, I say it was a non-issue. Glock has only recently given anything resembling “a shit” about the consumer market. They knew that people would buy what cops carried. ( we did get the 26 and 27 from the AWB, but that was ,ow hanging fruit).

    The problem for adoption of the GAP is —– it doesn’t do anything that the 45 ACP won’t do and the guns hold fewer round than available in the 21. Newbs don’t usually look for a 45 and gunny people have over 100 years of models to choose a heater.

    So while it’s a good cartridge, it is generally more expensive than 45 ACP and harder to find. I would personally choose a 40 as it can launch 135-150 grain bullets really fast (I like the 357 too). And I have seen 1 45 GAP pistol in a store. Glock never even tried to sell it to consumers.

    Now that 40 is not sexy anymore, I may pick up a 23. Or wait for them to make the model 49 silver slimline with 9 rounds.

  13. avatar El Duderino says:

    Asking .45ACP fans to adapt and change to something that “makes more sense” is like talking to a group of Amish about the wonders of electricity. I think that even if the .45GAP had been released at the same time as the .40S&W it would have fallen flat. Most people would have opted for the additional round or two in the magazine.

    First year with my deer and elk hunting group, I brought my Tikka .308. All the men hunted with 7mm or .300 Mags and the ladies had .30-06s. The patriarch of the group asked to see one my .308 cartridges. He looked at it, turned it over with his fingers, and said, “I don’t think you can hunt with us with that rifle.” I was dumbfounded…said as much…he mentioned how puny the case was. I asked to jump on his computer and show that this “puny” cartridge is essentially a .30-06, ballistically. Yes, I know it’s about 95% there normally, but I had Hornady Superformance ammo which exceeds standard .30-06 in most guns. That was good enough for him…but it’s funny what you have to prove to old school folks that know just enough about guns to load them and pull the trigger.

    1. avatar TruthTellers says:

      More like an additional 5 rounds in the full size and compact Glocks, 3 rounds in the subcompact Glocks.

      Recently I’ve changed my thinking and don’t see two less rounds as a problem, but 5 less rounds in a mag is not an option.

    2. avatar Conrad says:

      The .380 is demonstrably a poorer killer than the ’06. The 7mm at closer distances will shoot right through an elk without much expansion. Your friend was simply telling the truth, just as one should have to the gal on a Montana deer hunt who used a .243. I sat on a hill and watched her shoot and everything she hit died a miserable death crawling off, or through fences. These rounds may be capable in certain hands but generally should be avoided when they are tasked with larger questions.

      1. avatar Specialist38 says:

        Yeah. An LCP would be hard to hit with too.

        No edits for you.

        And a 308 will take most any animal in the 48….cleanly.

    3. avatar Joseph Quixote says:

      I’d still take that 300 Win Mag to put down a big elk a longer ranges. Much more so than the 7mm. In my thoughts the 7mm mag and the .30-06 are in the same category. Certainly a notch below that 300 Win.

  14. avatar TruthTellers says:

    Just to note, any .45 ACP chambered revolver that uses moon clips can shoot .45 GAP too. I wouldn’t shoot it in an M1917 or Webley tho.

    1. avatar Rad Man says:

      By extension that would mean a Governor/Judge would fire .410, .45ACP, 45LC, and 45GAP.

      1. avatar TruthTellers says:

        And .45 S&W and .45 Black Powder Magnum.

        1. avatar Rad Man says:

          Nice! May have to pick one up now.

  15. avatar Marty says:

    The 45 ACP may have been introduced in the early 20th century, but that doesn’t make it anywhere near an obsolete cartridge. The technology you talk about with the 45 GAP also brought the 45 ACP along just as well. There are many fine 45 ACP self defense rounds available today. I’d still be carrying one of my 45’s had not the same technology been there for the 9mm. I enjoy shooting my 45’s but I also enjoy the additional fire power of the 9mm’s. Never owned or shot a Glock, have no intention of owning one.

  16. avatar Setarip says:

    Let’s face the truth here…”Glock automatic pistol” does not sound as legendary as “Automatic Colt Pistol”. Also, there is a large portion of the gun community that does not worship all things Glock either.

    1. avatar Napresto says:

      I’m gonna go out on a limb and suggest that within 10-15 feet, both cartridges would probably hurt a bad guy. A lot.

      Everything else feels like much ado about nothing.

      1. avatar ozzallos says:

        And that, dear readers, is the point.
        There’s probably so little difference that everybody looked at GAP and said, “meh”.

  17. avatar Wood says:

    I bought a 1911 before there was a “gap”. I still have reloadable brass in rotation that’s older than the gap. By the time I bought a second .45acp, the gap was nowhere to be found. Given the volume of reloading I was doing for a while (BC, before children) the gap cases were only ever headaches because they had to be sorted out of my pickup brass. Then they disappeared…

    1. avatar MyName says:

      That’s about where I am. I have reloaded somewhere between 1 and 2 bajillion rounds of .45 ACP, and I don’t have a 1911 in GAP flavor, so I’ve never seen the point. I know exactly one person who owns a .45 GAP handgun and he bought it when he was a noob thinking it was .45 ACP. (And, he can’t sell it b/c no one wants it)

      The “it is a bit smaller and has similar performance” argument works with some cartridges, like .308 vs. 30-06, but military adoption of .308 had more than a little to do with that.

      As it turns out, there are a lot of cartridges developed in the late 19th and early 20th century that still have not been markedly improved upon in concept – loadings and bullet technology have, certainly, improved. (9mm Luger, anyone)

  18. avatar Bob Jones says:

    The .45 GAP is to the .45 ACP what a .380 is to a 9mm.
    A sissy round.

    1. avatar WI Patriot says:

      Now that’s funny…

    2. avatar Erik Weisz says:

      I think you mean a “Gillette” round.

  19. avatar Conrad says:

    Yea, and the .375 Ruger SHOULD have replaced the .375 H&H.
    And the .270 wsm SHOULD have replaced the .270.
    And the .40 SHOULD have replaced the 10mm.
    And, and, and.
    The GAP was made for women to handle when all they can manage is a 9.
    Get over it.

    1. avatar Specialist38 says:

      40 did replace the 10mm and then the 10mm became the 40.

      A giant circle of life…..Ha

  20. avatar daveinwyo says:

    The 9mm is older than the .45 and still works very well with today’s ammo and new weapons to shoot it. Even in a glock. Gaston Glock was a marketing genius, all the fans prove that. Still don’t like the glocks I have shot. In 9mm my Sig and Rugers are still better than a glock. So there.

    1. avatar Gadsden says:

      Right. I like how 9 fan bois act like 9 is a new cartridge like 6.5 creedmoor. 9 might be new to you if you just got into shooting yesterday, but it’s a very old round. Going by their own logic 9mm should be replaced by something newer and faster and shinny’er.

      1. avatar strych9 says:

        It was replaced. By the dreaded .9mm!

        At least that’s what I heard on the news.

        1. avatar Gadsden says:

          Oh yes! That one. I think they even mentioned in that report how the shine on the new round gave it extra speed by reflecting the suns photons, thereby reducing drag caused by sunlight.

  21. avatar Jon in CO says:

    The major issue with the Gap is capacity. That’s fine to run it in a time where AWB dictates capacity. However, changing calibers and seeing G21’s at 13+1, I don’t see a point at all. The 38 and 39 are a complete waste of time. Even die-hard 45 guys will take a 10+1 G26 over the exact same size gun in 6+1.

    You also have to contend with the same issues of 40, 357sig, which is much higher pressures. Guns WILL beat themselves to death faster than an ACP or 9mm. Higher pressure, and trying to push that same weighted projectile to higher velocities takes away the major benefit to 45, which in my mind is silencer capability. The 45acp is always subsonic, leaving no issues for error on ammo selection with a can. Lower pressure, subsonic, perfect suppressor platform.

    This is all subjective for the most part, so I could be completely dumb or ignorant. Who knows. I like the idea of GAP, but it’s biggest downfall I see is capacity. Fix that, and you might have an actual winner for the “bigger bullets are better” people.

    1. avatar Rad Man says:

      Die hard 45 guys, like me, go for the 10+1 Glock 30S.

  22. avatar Ark says:

    45 GAP: The point where Glock’s hubris became so great, they actually believed they could convince people to adopt a whole new caliber just so Glock didn’t have to design and injection mold another cheap polymer frame.

    1. avatar Chris says:

      Exactly. My M&P 45 holds 10 rounds of 45ACP and is way thinner than a Glock 21. It is one of the best grips I’ve ever held. If Glock wanted a 10 round .45 pistol, they should have took the plastic casing off of their magazines and recontoured the grip on the 21.

      1. avatar Nicholas Rodriguez says:

        The 21 still holds 3 more rounds so what’s your point?

  23. avatar enuf says:

    There are many cartridges that have been introduced and either failed or attained only limited success. The .45 GAP is one of those, successful only to the point of maintaining limited production of a very expensive product compared to other options. Other options for which many gun makers produce many designs compared to how many for .45 GAP? Springfield and Gaston’s Toy Factory, is that all?

    It failed folks. It failed and hangs on due to a cult following willing to spend money keeping it afloat.

  24. avatar Hannibal says:

    “Why carry a cartridge that’s outdated, wastes space and makes the gun unnecessarily bigger when you can carry a smaller cartridge and gun that achieves the same power?”

    Because .45ACP is widespread, reasonably cheap, and used in so many guns already that in order to supplant it you would want to make a major improvement. The relatively small difference in size isn’t gonna do it.

  25. avatar Widdler says:

    I remember GAP being expensive back in the day, no clue how much a box goes for now. Been so long since I bothered to look.

  26. avatar GPC says:

    .50 GI cough cough.

  27. avatar merlin says:

    no … it should not have replaced the .45 acp.
    that would have made millions of guns obsolete.
    the public certainly saw no need for it.

  28. avatar Gov. William J Le Petomane says:

    ‘…a 200gr JHP round was pushed out at 1,050 ft/sec and delivered about 490 ft-lbs in energy.’

    Meh… weak sauce IMHO. You can do better than that with a 2″ snubby .357.

  29. avatar Gov. William J Le Petomane says:

    And the 6.5 Creedmoor SHOULD share a place in the cartridge hall of fame right next to the .30TC.

  30. avatar Craig in IA says:

    Stick the .45 GAP in a G43 clone and I might be interested. I’ve shot a Shield in .45 ACP quite a bit and it’s easy enough to control, as is my .40 Shield. I’d love to carry a .45 but too big and heavy for me to actually conceal on my frame in the majority of offerings I have, from an old Detonics, Officer’s ACP on up through an STI custom. In the advent of a smaller .45 , I’d then have to decide: P365 9mm with 11 rounds of mousegun ammo v Glock 43 sized in .45 GAP, likely a total of 7 rounds. The 11 9mm rounds = 1265 grains, 7 .45s @230 = 1610…

  31. avatar Iron Cat Beast says:

    There is that whole part where it’s available from just about every known manufacturer, in numerous configurations, at numerous price points, and is a chambering available on dozens of popular handguns. Apart from that, no; there’s no logical reason whatsoever to go with .45 ACP in favor of the incredibly niche, ridiculously uncommon, and only superior for the dainty-handed .45 GAP.

    Fuckin’ “experts”, man. I swear to God, they’re so annoying…

  32. avatar WI Patriot says:

    “.45 GAP – The Cartridge That SHOULD Have Replaced .45 ACP”


  33. avatar Joseph Quixote says:


  34. avatar Ragnarredbeard says:

    If .45 GAP was so good, it would have replaced .45 ACP. It didn’t. Therefore, its not as good. Hard to argue with the free market.

  35. avatar Dyspeptic Gunsmith says:

    Replace the .45 ACP with a cartridge that is only as functional, just smaller?

    Nah. That’s never going to catch on. The people at Glock clearly knew (and still know) nothing about the mentality of the American shooter. That mentality is “gotta have MOAR!”

    Developing a cartridge that didn’t deliver “MOAR!” and only delivered “smaller” was destined for failure.

    Want to replace the .45 ACP and be successful? Deliver .45 pistols that are rated for the .45 Super, or the small primer version of the same idea. Now you’ve got a cartridge that is the same size as the .45 ACP, but delivering 250+ foot-pounds of energy more than the .45 ACP. Oh, and said pistols could still chamber the .45 ACP when they want.

    Want to ship a pistol that delivers MOAR! than the .45 ACP by a long damn shot? Then deliver a pistol in .45 WinMag. Now you’re talking of a cartridge that is every bit of a .44 RemMag in a semi-auto. Now you’re talking about a for-real hand cannon. Now you’re talking of a pistol that makes 10mm’s tuck tail and run.

    1. avatar Esoteric Inanity says:

      Precisely as Dyspeptic said, thus demonstrating that pompous bloviation is no substitute for experienced wisdom where such a nuanced topic is concerned. One can read and speculate about a subject extensively, yet still not have the knowledge of another who has lived it for years.

      The market/consumers decides what succeeds and fails. The industry professionals and gun bloggers/writers merely have some influence (select individuals vastly more so than others, especially in days of yore e.g. Jack O’Connor). Hence, give the consumer what they want, not what some “professional” thinks that they need.

      1. avatar Dyspeptic Gunsmith says:

        I had an impromptu gun-shop confab recently with the owner and customers recently regarding the MOAR! preference of American gun owners/buyers. The above posting was a result of this recent in-person confab in a gun store that catered to older guns as well as modern FN’s, Glocks, Springfield’s, etc plastic fantastics.

        We hauled out several CCW pistols from the glass sales cases from 100 years ago – before CCW was a term, and many states had no prohibition on carrying a pistol. Pistols like the 1903 Hammerless, 1908 Hammerless, Model 51, Savage Model 1907, FN 1905, some Beretta pocket pistols, etc, etc. I told people to find me the “highest powered cartridge” used in the century-old pistol designs. The answer was a .380 Auto. Many were .32’s, some .25’s.

        Then I said “Go look at the modern small-sized CCW pistol – that were about the same size as the pistols of 100 years ago… tell me the largest cartridge used…”

        and the answer was a .45 ACP. Shorty 1911’s, Broberg’s .45. OK, don’t like the .45 ACP? There were .40 S&W’s. Tons of 9’s. And a few .380’s.

        There’s the MOAR! preference in action.

        1. avatar Esoteric Inanity says:

          Yes, it’s perculiar how perspectives can change with the times and advancement of technology.

          What was once adequate for elk and other such game is now often looked down upon as subpar. Esoteric Inanity’s grandfather took quite a few bull elk (most larger than what are typically seen in the Gros Ventre Range today) back in the 1920s with a “lowly 30-30”. While this one will concede that a 30-30 isn’t the ideal gun for elk, it did the job just fine for many hunters in the early 1900s. These days there is no shortage to the number of fools that believe nothing less than a 7mm magnum is adequate for elk. As most know, shot placement is key and no additional amount of velocity or bullet weight can compensate for this.

          Another brief anecdote that coincides with the theme of consumer choice and the MOAR fallacy: Several months back Esoteric Inanity ran into an acquaintance of Wayne Baker’s at the Up In Arms gun show in Rock Springs. According to this individual, Mr. Baker was initially sceptical regarding his partnership with Dick Casull at the time(1978 to this one’s recollection) that both men had come together with the intention of marketing Casull’s mini revolver. Ostensibly Baker was concerned that the demand for such a gun would be limited due to little enthusiasm for a novelty item such as that chambered in .22 LR. To this one’s understanding, he was indeed correct in his assumption. While the mini revolver was profitable, it was far from a success. However, upon the development of the FA Model 83 in .454 Casull, Wayne was said to be more enthusiastic regarding the revolvers prospects. Purportedly, although he felt that the .454 Casull was an unnecessarily overpowered cartridge, he believed that such a beast would garner more demand with the handgun hunters of the time. (This account is anecdotal and Esoteric Inanity is uncertain of the validity of such claims.)

        2. avatar Wood says:

          But but but… if people understood they didn’t actually need MOAR then manufacturers couldn’t sell it to you. So they market the whiz bang new hotness cartridge to sell you new guns to fire it. And you “need” them because they eek out some nth degree of performance, unnoticeable to the majority of buyers.

          The main practical thing new cartridges have delivered since the black powder era is flatter trajectory, necessary for those disinclined to learn a little geometry. The only reason for magnum rifle calibers is distance or dangerous game (and detaching retinas),, and there are ample options for both that are older than I am. I guess the last place where new cartridge development makes sense is tailoring what can be done when one is self-limited to AR15 magazine and bolt dimensions.

          I’ve been enjoying the .38-55 quite a lot lately. If in need more “performance” than that I suppose ye olde .30-06 can deliver it. More still? I’ll turn to an older cartridge, the .45 2-1/10. In handguns there really is nothing new to do.

    2. avatar AD says:

      .45 Super looks very appealing on paper without all the mods of .460 Rowland. The Super is mainly just a recoil spring and headspace, right?

  36. avatar GlockMeAmadeus says:

    Gaston Glock couldnt sit idly by after creating the worlds most perfect pistols, he had to create the worlds most perfect pistol cartridge the .45GAP.

    I love the smell of perfection in the morning.

    1. avatar enuf says:

      I was awfully saddened when Robin Williams died, that man was a comic genius and a damned good soul.

      It is good to see from your post that comedy still lives on Planet Earth.

      Keep it going!

  37. avatar SteveM says:

    The G37 is outdated and wastes space, you lose your own argument to yourself.

    I hate the AWB and the arbitrary 10 round limit so much that I abhor firearms with 10 round magazines, give me 11 or more. I understand that in some firearms 10 rounds is the limit forced my other constraints (eg. G26).

    Recently I was looking for an oddball handgun for a truck gun just in case someone stole it. I wanted a thef to not be able to easily source affordable ammo. 45 GAP made that list but the G37 did not for the aforementioned reasons. So I got a 41 magnum.

    1. avatar WI Patriot says:

      “So I got a 41 magnum.”

      GREAT choice…

  38. avatar Vlad Tepes says:

    Even the great Guru and high priest of the .45 acp, the arrogant Jeff Cooper, admitted it was lacking in velocity and its one of the reasons he beat the big bore drums for the 10mm which proved to have another set of unforeseen problems to numerous to mention here. The Gap is a cartridge the was even worse. It has an added danger of detonations. There is little to no air space in the .45 GAP cartridge and just as in the 40 S&W cartridge if the cartridge suffers bullet set back during the feeding cycle especially in guns that have steep feed ramps a compression of the powder charge can and will cause a detonation that will turn a pistols slide into deadly flying shrapnel. Even brand new modern guns with factory ammo have detonated when using heavy loads in a similar cartridge the 40 S&W that also lacks air cartridge air space.

    The Gap (unlike the archaic .45 acp) was never designed for the traditional and more desirable 230 grain loads either and using such heavy bullets out of it increases pressure in a cartridge already using high pressure to achieve “almost” .45 acp velocity. Using the 230 grain bullet in the GAP results in excess wear and tear on pistols, which is also true when you us a 180 grain projectile out of the 40 S&W cartridge. Again heavy weight bullets in either cartridge is a bad idea with more pressure, more danger of a detonation and less velocity than with the lighter weight projectiles.

    The Gap was and is a failure in the development of the pistol cartridge and one wonders how the marketing geniuses ever thought such an abortion of a cartridge would ever be accepted by the ultra conservative .45 Acp worshipers. To use their line of thinking “only the .45 acp is patriotic” and only “real men” us the .45acp and no die in the wool Conservative wants to be haunted by the ghost of Sergeant York.

    I might add few people realize how anemic pistol cartridges really are and the Gap makes this even worse. I was amused when watching the comical and portly Michael Bane in his latest “Walter Mitty” style adventure into hog hunting. The hapless beasts were driven past him in a pathetic “fish in the barrel shoot” with him using a 10mm revolver. One undersized hog was hit no less than 4 times and it only made the hog run faster and squeal louder before the loss of blood finally put an end to the poor beasts misery and no the 10mm did not knock the hog down. Out of all the hogs massacred only one fell down to one shot which proved how anemic even pistol cartridges that are worshiped as powerful actually are not. I only mention all of this because when the 10mm fails so spectacularly how much worse would it be to use the pathetic under powered and anemic 45 Gap. As usual the only comments made were “man that was one tough hog” rather than the obvious “in your face truth”, “what a disappointing failure the 10mm cartridge really is”. If the Gap had been used instead I am afraid Mr. Bane would have been banished to the isle of Saint Helena convicted of cruelty to hogs by using a cartridge (the Gap) which only wounds and tortures.

  39. avatar Jud says:

    This article seems to sum up the mentality of too many LEOs in the US. If the author had a bit more experience in thinking outside the thin blue bubble, he may find that that logical evolution of the 45 ACP is actually the 45 Super. The reason it is not a household name is because the guy who developed the round wanted a royalty regarding anything associated with it and most probably was not well versed in negotiating.
    I carry 45 Super in a Glock 30 and am convinced that it is the best all around pistol cartridge that can be had.
    My defensive load is 120gr @ 1600fps w/ over 700ft lbs. Dont bring your feminine GAP to that fight bud.

  40. avatar tsbhoa.p.jr says:

    mind the gap.

  41. avatar Ralph says:

    Dump the .45ACP in favor of the .4GAP?

    Hahahahahahahahahahah! April Fool!

  42. avatar James says:

    As a younger guy, it just seems so alien to me having to deal with a nation-wide AWB. The fact that something like a Glock 19 would be unfeasible, that 9mm would be seen as the outdated cartridge is just insane, and I say that from behind enemy lines in NY

  43. avatar kevin littell says:

    I only buy guns I can get range ammo for at Walmart…

    It was touch and go for many decades with the Model 57 Smith and the Delta elite, but I am now a happy camper.

    I went6 to buy a GAP Glock when they first came out here in Atlanta, Asked the man if he had any spare mags and ammo. He said No and NOPE, nary a round.

    I ran, not walked away from that deal.

  44. avatar Red says:

    The problem is that the market is too small for the 45GAP. I’m also betting that the ammo is more expensive than 45ACP. So you can say what you want, but the problem is that this cartridge came out way too late in the game. The 45ACP has the inertia and changing that is like standing in front of a thundering train holding you hand out and expecting to stop it.

  45. avatar Aaron says:

    .45 GAP had to compete with hundreds of thousands (maybe millions) of units of installed base .45s.

    IOW, the tiny benefit of a marginal change in cartridge size doesn’t overcome the benefits of massive inventory of .45 ACP guns, ammo, magazines, holsters, accessories, etc.

  46. avatar idaho hiker says:

    There was no way 45 GAP was going to compete with the installed base of guns in 45 ACP, plus nearly a hundred years of existence and popularity. You’ve got one Glock pistol and maybe a few aberrations versus numerous pistols, revolvers, and carbines that are chambered in 45 ACP that were made during that nearly hundred years plus tons that are being made now. Plus you can get 45 ACP in bulk FMJ or hot defensive rounds in a LOT of places, and lots of people reload it.

  47. avatar Jeff says:

    The .45 GAP is probably popular among those who drive Edsels and Tuckers.

  48. avatar Jeff says:

    And I’m guessing the author wants do do away with flush toilets since they’re old tech also.

  49. avatar Derringer Dave says:

    The cartridge that should have replaced .45 ACP isn’t .45 GAP, it’s .45 Super.
    The .45 GAP is smaller than .45 ACP but with the same power, while
    The .45 Super is the same size as .45 ACP but has a lot more power (it’s like a .45 ACP +P+), and is suitable for bear defense.
    Midway has .45 Super for $19.99 per box for Underwood’s bear defense round,
    “Underwood Ammunition 45 Super 255 Grain Hard Cast Flat Nose Box of 20”
    255 grains
    1075 Feet Per Second
    654 Foot Pounds energy
    $19.99 per box

    The fact that .45 Super is the exact same dimensions as .45 ACP makes it easy to upgrade a pistol to .45 Super, and some pistols can fire both with only a change of springs. However, the fact that they’er exactly the same size makes it too easy to accidentally load .45 Super into a pistol designed for .45 ACP, shortening the life of the pistol (which would be like loading +P+ ammo into a pistol that’s not designed for it). The pressure difference is as follows:
    .45 ACP = 21,000 psi
    .45 ACP +P = 23,000 psi
    .45 Super = 28,000 psi

    According to Wikipedia,
    “Manufacturers such as Heckler & Koch GmbH currently offer pistols rated to fire .45 Super ‘out of the box’.[6] The Smith & Wesson Model 4506 and other models in the 3rd Generation 4500 series leave the factory with springs for the .45ACP, but feature full support for the .45 Super load when upgraded with a stronger spring. Although they will chamber, the firing of .45 Super rounds in non-rated standard .45 ACP automatics is not recommended, as doing so risks a case failure in the unsupported chamber and at the very least would batter the slide and almost certainly shorten the life of the pistol.”

  50. avatar Rich says:

    I have the 37 and enjoy it. Tryin to find a 38 & 39 in vase they discontinue them.

  51. avatar Will Drider says:

    Nope. You can’t say its great because its smaller in length and does “almost as much” when the majority of intended users don’t need that smaller length. Folks/Depts were already using the “smaller” frames on G17/22s no gain there. .40S&W was the compromise between big hole and big capacity with more power available in 10mm, so wheres the advantage to dropping more capacity for a slower cartridge. Free sidearm swaps look like a good deal but the avg. Joe looks closer before he parts ith har earned cash. Result there is really nothing to be gained with the 45GAP. I don’t recall a bunch of .45 GAP mag and barrel conversion kits, Why? Few takers and few ammo makers and still the was a shortage because ammo companies don’t produce large quantities for unpopular calibers and that also hurt LE that adopted it. The .45ACP &.45GAP isn’t even like the 10mm chop to .40SW because the really was no actual need for the GAP. Its on life support and promoting it wont change the outcome.

  52. avatar Nicholas A Rodriguez says:

    Sounds more like someone trying to justify why they wasted money on a round nobody cares about

  53. avatar wiggletons says:

    45 GAP just shortens the case made by the wasted space in 45ACP with modern propellants. It doesn’t offer any actual benefit except for those with battle-gnome hands (who’ll complain about every pistol grip out there). It was a round that attempted to supplant a round that is firmly seated in American culture without providing anything significant in return. The round was a failure at it’s inception.

    Now the 45 Super was a round that brought something to the table. It brought a rather significant increase in performance while still being able to shoot 45 ACP. Unfortunately, the problem is that most pistols cannot shoot a steady diet of it.

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