Barrel: Chrome moly steel. Chambered in 5.56 NATO or .223 Wylde, with a 1:8 or 1:9 twist rate, M4 barrel extension, and a carbine length gas system; Government profile barrel is finished off with an 13” SST M-Lok or Keymod free-float hand guard, 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. Bolt Carrier Group: Full-auto profile bolt carrier group. Shot-peened, mil-spec Carpenter 158 steel bolt. Gas Key Hardened to USGI Specifications, fastened with Grade 8 screws, and Staked Per Mil-Spec. Carrier is 8620 steel M-16 full auto profile and is nitride coated. Lower: These forged lowers are quality made using 7075-T6 aluminum and are marked `5.56` for caliber. Finish is hardcoat anodized. Mil-spec diameter 7075-T6 buffer tube is hardcoat anodized, has 6 adjustment positions, and is fitted with a M4 carbine stock. Rifle is finished of with a A2 grip, and mil-spec trigger.