The EXOS Defense AR15 Pistol Brace Receiver Extension is engineered to offer the ideal mounting solution for your SB15 stabilizing brace. Extended-length design positions the SB15 2.2” inches behind the pistol’s receiver and provides an overall length of more than 26 inches when used with a 10.3” or longer barrel. Perfectly sized to minimize or eliminate brace rotation and slippage. Hard-anodized aluminum construction ensures lightweight durability. Accepts any AR15 end plate (sold separately) and mounts with any standard castle nut (sold separately). Mount your SB15 pistol brace in the perfect position today with the EXOS Defense AR15 Pistol Brace receiver extension.