TacFire's AR-5.56 Unassembled rifle build kit includes a black parkerized barrel with a 1:8 twist rate, 1/2x28 A2 flash hider; a Slim M-Lok free-float handguard; 7075-T6 billet aluminum stripped upper; bolt carrier group; Mil-Spec charging handle, dust cover, forward assist, gas tube, low profile gas block; complete mi-spec M4 stock; A2 black pistol grip; lower parts kits all made in the USA.