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B&T USW Grip Module for Sig Sauer P320 Pistols
B&T USW Grip Module for Sig Sauer P320 Pistol

Price: $325.00
SALE: $235.00
Savings: $90.00

Stock Status:In Stock

SKU: BT-430174



B&T USW Grip Module for Sig Sauer P320 Pistols


The B&T USW-320 Universal Service Weapon Grip Module converts the Sig Sauer P320 Pistol (full size or compact) into the Universal Service Weapon configuration. The USW is the size of a normal duty pistol but extends the range, accuracy and effectiveness of your handgun to that of a 9mm submachine gun. It is ideal for any situation where the chance for a longer distance shot is possible.

This configuration will enable the operator to effectively and accurately engage targets out to 50 yards and beyond; that is more than double the effective range of a service pistol. Distances that were thought to be impossible with a standard handgun. The operator just removes the trigger group and insertes this into the patented USW-320 Upgrade Chassis. There are no other modifications to the weapon; the trigger group is held in place by the take-down lever. Furthermore the slide (full-size or compact) and the magazine holder are swapped to the new polymer lower. The whole transfer takes about two minutes. The USW-320 Upgrade Chassis has an integrated standard Picatinny accessory rail for a light/laser and the folding stock. It is still ambidextrous in handling, with the ambidextrous slide catch lever and reversible magazine catch. The folding stock folds onto the right side of the weapon, where the stock release is also situated. The stock can easily and safely be operated with either the left or the right hand. The USW-320 Upgrade Chassis accepts standard P320 magazines of 17 and 21 rounds and even any aftermarket 30-round size. The firearm‘s serial number is on the trigger group instead of the grip module and this is what is considered a firearm in most countries, not the Upgrade Chassis. This means that the USW-320 Upgrade Chassis is not firearm and thus is not serialized and can be sold and shipped with no restrictions.

The USW-320 will enable the shooter to produce very tight shot groups at 25 yards and to place first round incapacitating hits at distances beyond 50 yards. This is possible even under the stress of a life-threatening confrontation.

NOTE: Before installation you must first register your pistol with the ATF using ATF Form 1 as a Short Barrel Rifle.


Width: 1.70 inches (with folding stock closed)
Weight: 6.6 ounces (empty lower with folding stock)
Stock pull: 14.17 inches
Magazines: ALL P320 Magazines
Handling: Ambidextrous
Shoulder Stock: Right Side Folding

Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 6 Write a review »

  0 of 0 people found the following review helpful:
5 of 5 June 2, 2020
Reviewer: MT Arms LLC from Somerset, PA United States  
This grip module was very easy to install and functions flawlessly.

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  0 of 0 people found the following review helpful:
5 of 5 A well thought out product May 28, 2020
Reviewer: Chris from Raleigh, NC United States  
I got it as a fun novelty SBR project. Polymer feels just like any other handgun polymer. Stock feels solid with no wobble out of the box and the LOP is surprisingly long (slightly more than an MOE adjustable stock @ 14.17" vs 13.8"). Grip shape is serviceable. I've got tiny hands and found it a little on the boxy side but it wasn't uncomfortable. Would recommend.

I think Farrowtech makes an adapter to convert it to a brace but you can't holster it anymore.

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  0 of 0 people found the following review helpful:
5 of 5 Great. Best price around. April 24, 2020
Reviewer: Stefen S from West Bloomfield, MI United States  
You won’t find a better price!

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  1 of 1 people found the following review helpful:
5 of 5 B&T grip module October 21, 2018
Reviewer: Anonymous Person from Oceanside , CA United States  
Perfect fit ! High Quality as expected with Swiss manufacturing,  really stabilizes pistol with stock deployed . Can easily and quickly be removed .  Love it !

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  2 of 2 people found the following review helpful:
5 of 5 B&T USW Grip Module for Sig Sauer P320 Pistols September 18, 2018
Reviewer: b young from Lakeland, FL United States  
Great little, lightweight folding stock unit for the Sig P320 and super easy conversion with P320 being so modular. Stock is same plastic as the frame. Can't comment on use as I have to wait for my form 1 and engraving to be done to use it as an legal SBR.(and buy a P320 doner). Between the rails in the front there is a plate(facing down) to do the SBR engraving.  Has a nice lanyard attachment so you could shoulder carry it slung under your arm with out a holster if you were a 00 spy.

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