B&T USW-320 Polymer Lower For Sig P320 FCU Black For Sale

The perfect upgrade for the SIG Sauer P320! The revolutionary USW concept from B&T is now also available for the P320. The practical polymer conversion kit transforms a normal P320 (full-size or compact) in less than two minutes into a USW-320 with integrated stock. Just transfer the trigger group, the slide and the magazine release onto the USW-320 frame. The USW-320 lower equals the full-size P320 lower, so 17 round magazines (and bigger) can be used. Due to the integrated folding stock, accuracy and range is improved significantly.

*Grip module and stock only. Stock does not come installed on module.

Specifications

Fits
Sig Sauer P320

Magazine Compatibility
P320 17 rounds or larger

Width
1.70″

Length of Pull
14.17″

Weight
6.63 oz

Controls
Ambidextrous

Stock
Foldable

Key Features

The B&T USW-320 Polymer Lower incorporates several notable design elements:

• High-strength polymer construction
• Designed for compatible SIG P320 Fire Control Units (FCU)
• Ergonomic grip profile
• Integrated accessory mounting interfaces
• Lightweight design
• Modular architecture supporting compatible USW components
• Black finish

Overview of the USW Platform

The USW (Universal Service Weapon) platform was developed by B&T to provide a modular firearm system that integrates modern ergonomics and accessory compatibility. By utilizing the removable FCU found in the SIG P320, the platform allows compatible components to be configured around a single fire control assembly.

This modular approach enables different grip frames and accessories to be paired with the same FCU, depending on compatibility and applicable regulations.