AR-15 .300 AAC Blackout Pistol Kit with 7.5" Barrel

AR-15 .300 AAC Blackout Pistol Kit with 7.5" Barrel and Low Profile Gas Block Slimline Quad Rail Handguard This is an unassembled kit for building a functioning AR-15 rifle with a .300 AAC Blackout barrel. Lower receiver not included. Specifications Upper receiver - US made .223/5.56 Bolt Carrier Group - US made Standard Charging Handle Ejection Port/Dust Cover Assembly Forward Assist Assembly 7.5" .300 Black Pistol Barrel - US made Pistol Length Gas Tube - US made Low Profile Gas Block Muzzle Brake (Birdcage Design) 7" Super Slim Quad Rail Pistol Buffer Tube Buffer Spring 3.0 oz. Buffer Steel End Plate Steel Castle Nut