SIG SAUER Opens the New Custom Works P320 FCU and P320 Studio

From SIG SAUER . . .

SIG SAUER, Inc. is pleased to announce the SIG SAUER Custom Works P320 Fire Control Unit (FCU) is now shipping and arriving at select SIG SAUER Master and Elite Dealers.  The standalone P320 Fire Control Unit (FCU) enables an entirely new level of customization and personalization in the world of firearms; in addition consumers now have the ability to build a completely custom P320 using the P320 Studio at

“The P320 pistol is renowned for both its unprecedented modularity and unmatched capability to become the pistol of choice amongst firearms enthusiasts and all branches of the U.S. Military,” said Tom Taylor, Chief Marketing Officer and Executive Vice President, SIG SAUER, Inc.  “The soul of the P320, and the driving force behind its modularity, is the patented, serialized fire control unit that gives the consumer the ability to build their dream pistol from the ground up.”

The SIG SAUER P320 Custom Works Fire Control Unit (FCU) is a patented, serialized fire control unit (only available at select retail stores) that features a titanium nitride coating and lightened skeletonized trigger with an exclusive FCU Serial Number (FCU ###), and is compatible with 9mm, 357 SIG and 40 S&W calibers.

“In conjunction with the availability of the P320 FCU in retail stores, we are also launching the P320 Studio online at  This level of customization is an industry first and the virtual experience offers the consumer countless options and endless possibilities to build and view their custom P320,” continued Taylor.  “We are planning to take the customization element of this one step further, because we recognize that the consumer wants what they want, and sometimes that’s something SIG doesn’t offer.  By working hand-in-hand with premium after-market component manufacturers, FCU customers can quite literally build their dream P320 however they want.”

The P320 Studio gives the consumer a unique online experience to build a P320 pistol from the ground up by choosing a grip module, slide, barrel, guides and springs, optics, or complete CAL-X Kits with the virtual P320 configurator.  All parts available within the P320 Studio are available for purchase direct from

“It’s quite fitting that for the pistol known for its modularity, SIG has found yet another way to introduce an entirely new level of modularity and personal customization to the P320,” concluded Taylor.

MSRP: $349.99


  1. avatar MB (the real MB) says:

    The Russians did it well also, with the TT-33 Tokarev, Sig just has 80+ years of technology advancements in machine tools and metallurgy advantage.

  2. avatar I Haz A Question says:

    I’ve always been fan of 1911s, Glocks, and certain quality wheelguns, but I hafta admit that my curiosity is finally becoming piqued about the Sigs. Now that they’ve had enough time to be vetted by real-world users, it may finally be time for me to explore the idea of a Sig.

  3. avatar TommyGNR says:

    One of the things I like about the p320 is its really a platform (similar to the AR15). You can configure the gun anyway you want it and without having to use tools.

  4. avatar bleh says:

    The Studio is a great idea but frames for thumbs safeties aren’t available nor is the normal trigger group.

    1. avatar TommyGNR says:

      I think you’ll see those once they start adding 3rd party parts to the studio. Sig just rolled this out yesterday and all I saw was Sig parts in the studio. They promoted the 3rd party parts for the FCU at Shot Show, so my bet is we will see alot added over time.

  5. avatar PMinFl says:

    Maybe I don’t understand, if you have to change out all of the parts to make a good gun out of it then why buy it in the first place? just like glocks?

    1. avatar Serpent_Vision says:

      Large market between “have to” and “want to”.

    2. avatar tdiinva says:

      There is a small market for customization and it gets a lot more attention than vast majority of gun owners who buy and shoot an out of the box pistol. It started with aftermarket parts to fix issues with Gocks and now it has spread to designer pistols. It’s not going to make you a better shooter

      1. avatar Rand says:

        No, but some can be snobs about people that do shoot out of the box guns. Most of the time just saying you spent an outrageous amount of money for a $349 trigger feeds the addiction for some.

    3. avatar Mike H in WA says:

      I think you’re misreading it. It’s not that you need swap out all the parts to make it good, it’s that you can, if you so choose, swap out the parts you want to make the gun uniquely yours. Different sized hands are going to find different grips more or less comfortable. Some people want super light trigger pulls for competition. Some people prefer curved triggers, some prefer flat. I’m in a couple P320 Facebook groups, and by and large no one’s gun looks like anyone else’s.

      There is no humanly possible way Sig or Glock or anyone else can make a gun that is absolutely perfect for everyone stock. This allows you (especially once they get the 3rd party vendors onto the site) to build the perfect (or near perfect) P320 for you.

      1. avatar tdiinva says:

        You don’t need to buy a seperate FCU. Buy your first P320 and play away.

  6. avatar Dyspeptic Gunsmith says:

    IMO, this is the first really significant advancement in pistol design since the Broberg pistol (which is a pretty neat invention, IMO). It’s a shame that it was brought on by regulatory and contract parameters, but then again, the whole development of German drillings (exquisite as they are) was a response to a regulatory environment.

    The aftermarket component market for this is going to exceed that for Glock. Now you choose so much more about your pistol than with a Glock, where Glock has pre-ordained what your grip size/volume/etc configuration is going to be. Here, you could have a slim grip, a fat double-stack, you could use this to create a IPSC/USPSA competitive pistol, then pull the FCU and put it into your carry pistol configuration. This makes the “gun-a-month club” proponents lose their minds.

    1. “This makes the ‘gun-a-month club’ proponents lose their minds.”

      Precisely. And won’t that be a shame?

      The only potential hiccup would be if the Democrats get control of the Senate and manage to push through a ban on internet sales of gun parts. Then you’d have to rely on your LGS to stock (or order) grips/slides/barrels/whatever for you.

      1. avatar tdiinva says:

        Just because you can reconfigure it you still have only one workable gun.

        1. avatar Dyspeptic Gunsmith says:

          Until you start working on re-creating a FCU of your own from bits of sheet metal, rivets, springs, and such.

          Look at that FCU. I mean that literally – look at it. Look at it with a critical eye, folks. What’s in there? Some sheet metal. Some curves/bends. Some radiuses in the corners, some holes drilled in it, etc. A couple of pins, some springs, etc.

          Now, start thinking of what you need to do to make one. The level of metalworking there is easily within the range of tools that most people will have in their garage. They’ll need some teaching and coaching from someone who knows how to drive a file, hacksaw, jigsaw, etc, but there’s nothing on there you cannot make with a good bench vise, a hammer, files, saws, and a hand drill. With a factory-produced one as your template, you could knock out one of these FCU’s under improvised conditions a heck of a lot easier than you could make the frame for a 1911 on a mill or the frame for a Glock in an injection mold.

          Sig did us a solid here, people.

        2. avatar tdiinva says:

          You are projecting. Only a relatively few people have those skills. Sure they could supply others but that is how you go to jail.

        3. avatar TheUnspoken says:

          That is usually the case with modular guns, suppressors, sig x change caliber swaps, .22lr conversions, AR uppers, etc… It sounds good to buy one gun and change it to as bunch of configurations but a lot of times it is almost as cheap, and certainly more handy, to just have multiple guns in whatever calibers or setups, ready to go. Unless you live in a European country that limits how many guns you can own, in which case conversions make a lot of sense to stretch the limits of what your allowed gun can do.

        4. avatar Dyspeptic Gunsmith says:

          Since I’ve taught dozens of people from 18 to 68 to have those skills, no, I’m not projecting.

        5. avatar tdiinva says:

          Dozens in a country of 330 millions is an unseen number.

    2. avatar Umm . . . says:

      The grip frames are roomy enough that they provide amazing space for gunsmithing projects / experimentation, even if one is using a system quite different from SIG’s.

      The only downside for me is that the fact that the P320 came before the P365 (and won huge military contract(s)) means SIG sees no incentive / point in providing similar aftermarket support for its (theoretically equally modular) new improved model.

      1. Don’t be so sure. The P365 has been hugely popular and it’s every bit as modular as the P320. If the 320 FCU program proves popular (and profitable), I wouldn’t be surprised to see 365 FCUs sold too, someday.

        1. avatar Umm . . . says:

          Oh, engineering-wise, it certainly is equally modular. For me it’s not about the availability of FCUs, though: I own a P365 already, and it’s such a game-changer in its category that countless others are buying them as well. It’s about the plethora of grip frame sizes, slide/barrel lengths, etc. that are everywhere for the P320 and (AFAICT) nowhere for the P365.

        2. avatar Dyspeptic Gunsmith says:

          The P365 has been a complete game-changer for me, at least.

          First, the little gun is quite accurate for the size of the thing. I’m truly impressed by the groups I get shooting it one-handed at 50 feet. Groups slightly under 3″, one-handed, bullseye style stance. For such a short barrel and “meh” sights, I’m impressed.

          Second, it’s so small, I now carry almost all the time. No printing, nothing seen, no holster on my waist, no shoulder rig…

        3. avatar Umm . . . says:

          Exactly! People who haven’t experienced it pretend, on one hand, that pistol weight makes no difference; and then on the other hand talk as if one needs a belt forged from battleship armor to conceal properly. As time’s gone by (and I’ve moved to a warmer climate) I’ve grown a lot more casual. If I do my part, the P365 disappears under gym shorts and a T-shirt.

        4. avatar tdiinva says:

          I can pass the Army’s Alternative Combat Pistol Qualification Course which is shot at 25 meters with a stock G42. It’s the archer not arrow.

          Now tell me how much better a tiny gun is when it’s January and the temperature is below zero.

        5. avatar Umm . . . says:

          If your summer carry conditions differ and you’ve found something that works for you, I’m glad. I wear what I wear and believe in buying gear that works for me rather than working around my gear.

          Versatility translates to consistency in training (same trigger, controls, etc.). From that standpoint, a product with a summer advantage that becomes unnecessary in winter is objectively superior to one that works in winter but is useless (or requires major workarounds; see above) in summer – particularly since my area doesn’t experience winter in any “below zero” sense. My most recent gym shorts / T-shirt errand was this week, to buy our Thanksgiving turkey.

          As the weather cools, I’ll wear a heavier shirt and maybe a jacket. My P365 will retain every capability it had in the summer, plus the 15rd magazine – gaining the capacity of an M9 without moving up to the latter’s cereal-box size, weight, and concealability. At no time will I find myself wishing the SIG was heavier, poked deeper into my bladder when seated, needed a bigger pants size, or required me to count the ounces of cowhide in my belt.

        6. avatar tdiinva says:

          You might not but DG lives in Wyoming which gets very cold.

          As an afterthought, optics is what has revolutionized small pistols. There is nothing special about a P365 or Hellcat with iron sights. Sight radius is less important when you have a red dot. I would like to see how red dot compares to irons when you are moving. I have no preconceptions on how such a test would go but all I have seen is static tests.

        7. avatar Umm . . . says:

          Right – horses for courses! I probably came across as a subcompact-extremist before, but about 1/3 the time I OC with a pistol closer to the other end of the spectrum.

          From the standpoint of aiming and speed I loved the dot sight I tried, but unfortunately it turned my RIA 1911A2 into a manual repeater about 90% of the time, even with both springs lightened. I should try it on a different pistol.

  7. avatar American Patriot says:

    Similar to an AK the FCU is a punched out & formed from sheet metal & now they have another excuse to charge a higher price!

    1. avatar mrlyle says:

      Exactly!! Cost to manufacture FCU is probably in the $15 range

      1. avatar LKB says:

        Will be curious to see if 80% FCU’s can become available (and are reliable). Now *that* would drive the gun grabbers nuts.

    2. avatar Dyspeptic Gunsmith says:

      Yes, which provides them an opportunity to cut prices once the market becomes more established.

      Sig (and I’m sure others) have learned what we learned the really hard way in the computer market: You cannot introduce a product and later raise prices easily. It is much, much easier to introduce a product at a higher price (even if that price is only to inflate the profit margin) and then later lower the price – because that is what the consumer expects.

  8. avatar hadouken111 says:

    I have a sig P320 in 9mm compact and .40 full-size configurations, as well as a p365 and p229. As you can tell I really like sig. I will say an exception has been made with a CZ shadow. I like it so much I put my p226 on consignment at a local gun store. I still have a beretta 92A1 so I really don’t need all of those full-size pistols.

  9. avatar Red in CO says:

    It’s funny, TTAG keeps running these press releases from Sig about how amazing their modular P320 is and how they keep adding new customization options. From the media blasts you’d think the entire gun world was clamoring for this product, and yet I still see basically none in the wild or on store shelves (and my local LGSs still have plenty of handguns in stock), and from what I’ve seen, anecdotally of course, there doesn’t seem to be a ton of grassroots buzz. The P320 has been effectively dead in the water since it was revealed that their combat handgun liked to fire itself when touched by a strong wind.

    This *could* have been earth shattering if it had actually been done by a trustworthy and competent company. What a shame.

    1. avatar TommyGNR says:

      Ugh I think that is because they are sold out.

    2. There are none in the wild because they are shipping the first FCUs to dealers this week.

  10. avatar DeloisBLuken says:

    This level of customization is an industry first and the virtual experience offers the consumer countless options and endless possibilities to build and view their custom P320,” continued Taylor. “We are planning to take the customization element of this one step further, because we recognize that the consumer wants what they want, and sometimes that’s something SIG doesn’t offer. By working hand-in-hand with premium after-market component manufacturers, FCU customers can quite literally build their dream P320 however they want.” 

  11. avatar busybeef says:

    “I always wanted a frankstein’d $2,000 plastic gun instead of just buying a good entry-level 2011” said every Glock fanboy ever.

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