TacFire's AR-300 Unassembled pistol build kit includes a black parkerized barrel with a 1:7 twist rate 5/8x24 spiral fluted Krink style frowarder muzzle device; a Slim M-Lok free-float handguard; 7075-T6 billet aluminum stripped upper; 5.56 bolt carrier group; Mil-Spec charging handle dust cover forward assist heavy buffer pistol length gas tube low profile gas block; complete pistol buffer tube A2 black pistol grip and lower parts kits all made in the USA. Steel/Aluminum Finish - Black Parkerized AR-Style