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Action: Semi-auto direct impingement
Gas System: Carbine Length Gas System
Chamber: 5.56 NATO. This upper will also shoot .223
Twist Rate: 1/7 button rifled
Pivot/Takedown Pin Size: Small pin - .250"
Muzzle Device: Thread 1/2 X28 ARD MUZZLE BRAKE
Barrel: 16" M4, 4150V steel, chrome moly, heat treated, Black
Handguard: ARD Carbine - length Free Float
Upper Receiver: Forged 7075 T-6 Mil-spec with t-marks
type 3 hard coat anodizing with forward assist and ejection port plate
Muzzle Device: Thread 1/2 X 28 (ARD AMERICAN RIFLE MUZZLE BRAKE)
Bolt Carrier Group: MIL-SPEC Chrome Moly Carrier Carrier Key - Chrome lined
Attached with grade 8 Screws Properly Staked & Sealed gas key
Bolt: Phosphated-Carpenter Steel M.P.I. Heat Treated
Charging handle : Comes With Tac Latch