Barrel: 20" 4150V Chrome Moly vanadium steel, nitride coated and chambered in 5.56 NATO with a 1 in 7" twist. The rifle-length gas barrel is finished off with a quad rail handguard with vertical grip and rail covers, a .750 Front Sight Base, and an A2 flash hider. Upper: Forged 7075-T6 A3 AR upper is machined to MIL-SPECS and hard coat anodized. Uppers include forward assist and dust cover. These uppers are made for us right here in the USA by a mil-spec manufacturer. Includes carry handle assembly. Bolt Carrier Group: Bolt made of mil-spec shot-peened Carpenter 158 steel. Gas key is secured with grade 8 fasteners and staked per mil-spec.