Barrel: 10.5" 4150V Chrome Moly vanadium steel, nitride coated and chambered in 5.56 NATO with a 1 in 7" twist. The carbine length gas barrel is finished off with a PSA 9" Lightweight Hex Full Picatinny M-Lok Free Float Rail, a low profile gas block, and a PSA A2 Flash Hider. Upper: Forged 7075-T6 A3 AR upper is made to MIL-SPECS and hard coat anodized black for durability. Featuring a mil-spec finish, these uppers are made for us right here in the USA by a mil-spec manufacturer. 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. Lower: These forged lowers are quality made using 7075-T6 aluminum and are marked "MULTI" for caliber. The finish is hard coat anodized. Pistol 7075-T6 buffer tube is hard coat anodized and is fitted with an SB Tactical SBA3 Adjustable Pistol Brace, PSA Classic A2 Grip, and PSA Mil-Spec Single Stage Trigger.