Barrel: Chrome-moly vanadium steel barrel chambered in 5.56 NATO, with a 1:7 twist rate, M4 barrel extension, and a carbine-length gas system. This M4 profile barrel is finished off with a 13.5" PSA Lightweight Hex Full Pictanny M-Lok free-float handguard, low-profile gas block, 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. BCG and Charging Handle are NOT included.