A Brownells exclusive, this 16" forged upper receiver stands for the best value in a complete package and comes ready to run with any mil-spec AR-15 lower right out of box. This complete upper features: Forged 7075 T6 upper receiver 13" 6061 T6 MLOK handguard with heavy-duty barrel nut 16" 4150 CrMoV nitride barrel, twice stress relieved Mid-length gas system (.750 gas block) Mil-spec M16 profile BCG and charging handle 1/2x28 threaded muzzle with A2 birdcage 8620 Nitride Carrier and 9130 Black Oxide Bolt Each upper is test fired to ensure reliable function Mfg: Kak Industry Llc.