Compatible with SIG® MPX® and SIG® MCX® pistols (excluding SIG MPX Copperhead), the SB Tactical® MPX PSB™ Polymer Pistol Stabilizing Brace easily attaches to the rear-mounted 1913 Picatinny rail on the pistol with an integral M1913 adjustable housing. Plus, this 3-position adjustable pistol brace features a soft, rubberized body with an adjustable nylon strap, designed to wrap securely around your arm to provide increased stability, improved accuracy, and enhanced reliability. Made in USA.