The MPX PSB is an innovative, 3-position adjustable Pistol Stabilizing Brace dimensioned to fit the receiver cuts of the SIG SAUER SIG MPX and SIG MCX. Ships as a complete assembly, ready-to-install, including an M1913 receiver saddle. Features: 3-postion adjustable. Dual compatible with SIG MPX and SIG MCX. Complete assembly, ready-to-install, with an integral M1913 adjustable housing. ATF compliant, US veteran designed and proudly made in the USA. Product Includes: complete assembly, adjustable nylon strap.