SHOT Show: Mossberg’s 590S Optics Ready Pump Shotguns

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One of the stops on our SHOT Show list that somehow didn’t get made was to see Mossberg’s new 590S optics-ready personal defense pump guns. The 590S is Mossy’s shotgun that can cycle everything from 1.75-inch mini shells to 3-inch high brass loads. Adding optics-readiness is the next logical step.

MSRP is $704 wether you choose the 18-5-inch corncob model or the M-LOK equipped 20-inch choked version.

From Mossberg . . .

The flexibility of the 590S Series of 12gauge shotguns has been enhanced with the addition of two opticready versions. Available with 20inch and 18.5inch barrel lengths, these pumpactions are capable of cycling 1.75, 2.75 and 3inch shotshells interchangeably without the use of an adaptor; and now, you can directly mount a lowprofile, microdot sight to the receiver.

Mossberg 590 tactical shotguns feature nonbinding twin action bars; positive steeltosteel lockup and antijam elevator; dual extractors; drilled and tapped receivers; ambidextrous topmounted safety; and convenient cleanout magazine tube with cap for ease of maintenance. Standard features of the opticready 590S series include black synthetic stock and forend; cylinder bore barrel (AccuChokecompatible barrel on the 20inch version); matte blue metal finish; sling swivel studs; and logoengraved receiver.

Key design elements of the 590S platform include a redesigned elevator and bolt slide combined with the addition of an energyabsorbing bumper. This patentpending design allows the user to load their choice of shotshell length (1.75, 2.75 and 3inch) and shotshell type in any combination. And use of shorter shell lengths will also
increase the overall capacity of the 590S.

590S OpticReady PumpAction Shotguns (51604/51605) Available with choice of 18.5inch cylinder bore barrel, featuring a front bead sight and corncob forend or a 20inch version with AccuChokecompatible barrel (Cylinder choke tube included), front bead sight, and versatile MLOK® compatible forend. Both models feature receiver cuts to accept the direct mounting of microdot sights (Shield RMSc footprint) and a cover plate is included for use when a sight is not mounted. MSRP: $704

Check out the newest members of the 590S series of pumpactions and Mossberg’s extensive family of autoloading and pumpaction security shotguns at

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  1. Okay, this is just my own two cents, so chillax before anyone jumps at me for it, m’kay?

    Red dots and optics have their place. Quality glass for hunting rifles; dots and magnifiers for ARs; RMRs and micros for some handguns. I get that. I even have a Romeo 5 on one of my own items, and I think it is excellent.

    But on a shotgun, I just don’t think it’s good to have an optic installed. If for indoor CQB, how is a red dot going to help within the short distance of a hallway or room? Last month, one of my buddies bought (another) new semi-auto shottie and promptly installed a red dot on it. We went to the range for a round of instructor-managed trap, and my buddy got a score of only 6 out of 25 clays. The instructor’s first words out of his mouth were literally “take that sh!t off your gun and you’ll shoot trap better”.

    I’ve shot 12-ga with iron sights all my life, both clays and defense models. The *only* time a dot helped was when I borrowed one of that same buddy’s other shotties and the targets were way out beyond 50 yds and not moving. But for close quarters or quick-moving targets, it doesn’t help me one bit. Didn’t help my buddy, either. And the instructor wasn’t impressed with it.

    Everything has a purpose and a “best” way of working. Some things just aren’t that good, like that 10mm wheelgun in the article posted earlier today.

    • Consumerism Haz. It’s funny that you brought up both red dots and another 10mm. In the past week I just mentioned that I thought 10mm guns were the new red dots. It’s the industry push to make you think you need to spend more money on something you don’t really need.

      A red dot to shoot trap sounds silly. I took an NRA shotgun course after I bought my Mossberg 500. I was the only one there so it was private instruction. I had never shot a shotgun before that day. The only long gun I owned then was a Marlin Model 60. With my simple 28” pump with a bead sight, I shot 23 out of 25 the first time I tried it.

      I’m sure he was a good instructor. He had me shoot paper first. Then he had me use my hands to pretend to shoot the trap. Then he had me track it with the shotgun several times without firing. When I was ready to shoot, it was easy.

  2. A shotgun is pretty much the only thing missing in my collection. I really would like one for home defense. I need to shoot before I buy one though.

  3. When I said “Just buy a shotgun. ” I didnt mean something like that. I’m sure that’s an assualt shotgun and it holds more then 8 bullet rounds and is on my No No lust, I mean list, (dreaming of kids playing with my blond hairy legs again) it’s hard to keep my mind on,,,, (Think, Think about what it is your thinking about) I uh uh uh, If you were a hot dog and you were hungry would you eat yourself, I know I would.

  4. Being able to run mini shells mixed with longer ones is the only thing missing from my 590A1. Fortunately I have an old(ish) Winchester 1300 Defender that will run them all that was made before the mini shell was a thing.

    • Well except for when they were under Cerberus ownership, almost need to cerakote those by default and some have a rough extraction (occasionally can rip through the shells rim if cheap ammo).

        • Pre 2007-2020 was the time frame with the worst of the qc (that we observed) being around 2009-2014 for 870,700, and various marlin levers (unknown timeframe) especially at base models. Most of the higher end products were fine but for entry level stuff the terms rustington and Remlin did have merit. Up end I did get to learn how to strip and refinish a reciever.

  5. A company called Critical Defense has an adapter that permanently installs on the Mossberg 500 and 590 series. It allows you to load and shoot the mini shells and standard 12 gauge shells or mix them if you wish.

  6. All I can say is “Whoopee Do”! Optics on a short barrel, home defense pump shotgun, is ludicrous. BUT if somebody just has to have it, could be added for a whole lot less.on an affordable Maverick 88.
    The ability to load a mixed-batch of shells without an adapter for the 1.75 shorties is “nice” BUT for under 20 bux. I can buy and install the adapter in an 88 or 500 to make either into a dedicated shirt-shell home defense shotgun.
    Mossberg needs to work on improving their fit and finish on their entire line. of shotguns and leave the gimmicky alone. like why my 88 is rusting at the end if its barrel after just 4 months and only 8 shells thru it.( Not a humid house btw)

    • Recentish (previous management) Remington had issues with rust as well. Sometimes you just have to refinish the effected area and that is the hidden cost.

  7. The best scores in competition tactical shotgun result from the use of red dot optics and magazine fed shotguns. The targets are static steel, rotating steel and clay discs that go straight up and down. Red dot optics are popular on Turkey and Deer shotgun builds. I have a red dot on my home defense semi-automatic shotgun and it is faster than the co-witnessed ghost ring sights.
    Brass and Fiber Optic front sights are fast and accurate but do require a good mount compared to a red dot that is more forgiving. I have not seen red dots used on the Trap Range but only time will tell if it can work.

  8. For shotguns, an Eotech is the best.
    The Eotech holographic reticle is the fastest sight in the world, bar none!
    Built like a tank, too. Comes in red or green (green works best with my astigmatism).

    Some may complain that the Eotech has a battery life of “only” 800 hours.
    “Only” 800 hours? Who shoots more than 800 hours in a year?
    Nobody, except professional shooters or soldiers, and the US military trusts the Eotech as a combat optic for CQB.
    For those of us who aren’t on active duty in a war zone, replace the battery once a year (just to be safe) and you’re golden.


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