The BCM AR-15/M16 Pistol Receiver Extension kit has a 1.2" outside diameter which makes it compatible with the Sig Sauer SB-15 Stabilizing Brace. Made from 7075 T6 aluminum with a hard coat anodized finish, accepts carbine buffer and action springs. Mfg: Bravo Company SPECS: Made in the USA and manufactured from high quality 7075 T6 aluminum.
