Overview
The trend-setting patented concept of the B&T USW is convincing. Carbine accuracy with a normal duty
pistol enables any operator to more than double the effective range of his service pistol. B&T therefore
decided to apply the USW concept to other pistols. Due to its modular design and its widespread use, the
SIG Sauer P320 is a prime candidate to be upgraded to the USW concept. A slightly different chassis for
the M17 is also available, other pistols to follow. The operator just removes the trigger group and inserts it
into the 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 features an integrated standard Picatinny rail for a light/laser and the fol-
ding stock. It is still ambidextrous in handling, with the ambidextrous slide catch lever and reversible maga-
zine catch. The folding stock folds onto the right side of the weapon, where the stock release is also located.
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 in most countries.
