Barrel: 16" Chrome Moly steel. Nitride treated and chambered in 5.56 NATO, with a 1/7 twist, M4 barrel extension, and a mid-length gas system. The barrel is finished off with a classic FDE mid-length handguard, F-Marked .750 gas sight base, and 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. *Bolt Carrier Group and Charging Handle Not Included