Features Barrel: 11.5" 4150V Chrome Moly vanadium steel, nitride coated and chambered in 5.56 NATO with a 1 in 7" twist. Carbine-length gas barrel is finished off with a DPMS Lightweight 10.5" M-Lok 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. Barrel Length: 11.5" Barrel Profile: A2 Gas System: Carbine-Length Barrel Steel: 4150V Chrome Moly Vanadium Barrel Finish: Nitride Chrome Lining: No Muzzle Thread: 1/2x28 Chamber: 5.56 NATO Twist Rate: 1:7 Barrel Extension: M4 Diameter at Gas Block: .750 Gas Block Type: Low-profile Muzzle Device: DPMS A2 Flash Hider Receiver Material: Forged 7075 T6 Aluminum Receiver Type: M4 Handguard Type: DPMS 10.5" Lightweight M-Lok Rail Bolt Carrier Group Included: Yes Bolt Steel: Carpenter 158 Bolt Carrier Profile: Full-auto Charging Handle Included: Yes