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Specs as seen on Diamond Back site: • Caliber: 5.56 NATO/ .223 Remington • Finish: Black Anodized Hardcoat and FDE Cerakote • Barrel: 16" 4140 Chrome-Moly, Free Float, Black Nitride • Barrel Twist Rate: 1:8 • Gas System: Carbine Length Gas System • Bolt Carrier: Shot-Peened, Magnetic Particle Inspected MilSpec 8620 carrier, Black Nitridewith 158 Carpenter Steel Bolt • Lower Receiver: Forged 7075 T-6 Aluminum, Black Anodized • Upper Receiver: A3 Flattop Forged 7075 T-6 Aluminum, Black Anodized • Handguard:12" Diamondback Aluminum M-Lok, FDE • Trigger Group: Mil-Spec • Pistol Grip: A2 Style, FDE • Stock: 6-position ATI Mil-Spec Buttstock and Buffer Tube, FDE • Mag: 30 Round Aluminum Magazine • Overall Length (Stock Collapsed): 32.5" • Overall Length (Stock Expanded): 36.25" • Flash Hider: A2