A high quality lower build kit with everything you need to assemble your AR-15 lower into a pistol. Features Mil-Spec Fire Control Group, Classic Grip, USGI Trigger Guard, and black oxide coated hammer and trigger springs. Also includes an SB Tactical SBA4 Adjustable Pistol Brace, castle nut, latch plate, carbine buffer spring, 5 positioning mil-spec buffer tube, and standard carbine buffer