Coming Soon: B&T USW Grip Module With Stock for SIG P320

Teaser photos of the B&T USW-320 have been circulating around the interwebs for a few months now. We should have covered it but sometimes these things slip through the cracks. Basically it’s a stripped polymer pistol frame that accepts SIG P320 parts.

The best part of the design: the serialized part in the modular design P320 is the fire control group housing. That means you can buy a P320 and enjoy it while you wait for your federal From 1 permission slip to come in. You can also move the fire control group hosing between different weapons and have only one serialized part.

B&T should be releasing the frame and stock soon. In fact some websites are already taking pre-orders. For specs on the frame check out the B&T website. Here are B&T’s specs:

Delivery The scope of delivery consits only of the lower frame with integrated folding stock but without any attached or built in parts.
Width 43 mm (1.7 inches)
Weight 188 g (6.6 oz) Lower with folding stock
Stock Length of Pull 360 mm (14.2 inches)
NAR Rails 1
Magazines P320 magazines, 17 round and larger
Handling Ambidextrous
Shoulder stock Foldable
Remarks Available from April 2018 on

The frame sells for a penny under $300 and is available in your choice of black and tactical peanut butter.

Based on B&T’s track record for design and build quality, this could end up being an excellent,affordable SBR platform. No, it doesn’t take GLOCK mags and you can’t get a version with a brace. See the comment section for the obligatory drop safety jokes.


  1. avatar Owen says:

    That’s not a stock! It’s a drop safe fall arrester.

  2. avatar Mike says:

    Ummmm… not to be a grammar pig but it’s “slipped through the cracks.” Otherwise an excellent idea. Might be considering that.

  3. avatar John Thayer says:

    Could it not have been produced with a “brace” instead of a “stock” and still retain classification as a pistol when installed? Just curious!

    1. avatar Joe Brow says:

      It needs to be a brace.

    2. avatar Removed_californian says:

      I’m sure a Brace can be designed for it. Just pull the axis pin from the stock and put a new brace assembly in it.

      1. avatar Mike H in WA says:

        Several companies already make braces and brace adapters for B&T products.

  4. avatar rudukai13 says:

    “See the comment section for the obligatory drop safety jokes.”

    Way to get out ahead of an issue, TTAG.

    In all seriousness, I don’t see this being very popular in the civilian word at least until someone gets a compatible brace approved by the ATF. Considering this is compatible, however, with the military’s new standard-issue sidearm…I bet at least a couple double-super-secret squads are drooling over this at the moment

  5. avatar Newshawk says:

    One more nit to pick–it’s not a “stripped frame.” According to SIG, it’s a “grip module.” The frame is part of the Fire Control Unit, the serialized part that is the firearm.

  6. avatar Baldwin says:

    SBR’s suck. Can’t conceal, can’t cross state lines. As a “rifle” it has a magazine capacity restriction for open carry (in VA). This thing is crying out for a legal, minimalist, tiny arm brace/hook.

    1. avatar MICHAEL A says:

      Curious. I am brand new to living in VA. I have not heard of any magazine limits to rifles, much less SBRs. Can you point me to the law about this?

        1. avatar MICHAEL A says:

          Thanks very much. I was informed that that particular law had been rescinded. In either case it does not apply to us who hold valid CC in the state.

        2. avatar Baldwin says:

          Carve outs are wrong. Everyone deserves the same capacity.

  7. avatar little horn says:


  8. avatar Shire-man says:

    There’s also the XO1:

    Though these two offerings aren’t exactly game changers or even useful but it is nice to see the p320 modularity being utilized in different ways.

    1. avatar JB says:

      Neat! Thanks for the tip on this.

  9. avatar c4v3man says:

    I think it’s awesome, for the sole reason that it can be holster carried without much additional bulk over a standard pistol. Using a brace is going to make the entire piece larger at the muzzle when folded, which negates much of the point of the design… I’m all for having a brace option, but this seems arguably worth getting a $200 stamp for.

    That being said, if you’re going to need a stamp anyways, and you’re replacing the entire grip/rail of the gun, I would hope they will eventually offer a model with an integrated light and fold-down VFG since that’s OK on a SBR, but not permitted on a pistol/braced pistol.

  10. avatar Andrew Lias says:

    Neat AF, hoping for a review. Not too pricey either. With the P320 being available in .45 ACP I would drool over a 460 Rowland conversion with this setup.

  11. avatar c says:

    I wonder how drop safe is the TTAG staff. I propose we commence testing, …, what they already act as is they had been dropped 2 meters unto concrete head first? That explains a lot. Yes, I am a fan of drop testing contributors (from at least 2 meters, head first, I’ll give you the exact angle) to TTAG articles for as long as they do not drop old irrelevant issues.

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