SB Tactical SBA3 AR-15 Pistol Brace Black with Mil-Spec Carbine Buffer Tube Kit. Kit includes a SB Tactical SBA3 pistol brace in black, a mil-spec carbine buffer tube, and an adjustable nylon strap. Designed for AR-15 style receivers that use mil-spec carbine receiver extensions. The SBA3 is 5-position adjustable and features an integral ambidextrous QD sling socket. Fits standard mil-spec carbine tubes and is intended for use on AR-15 style rifles or pistols with SB Tactical SBA3 brace.