Caliber: 7.62X39. Barrel: Diamondback Barrels 7.6239, 7", Heavy, 4150 CrMov, Black Nitride. Barrel Twist Rate: 1:9.5. Gas System: Pistol-Length Gas System. BCG: Shot-Peened, Magnetic Particle Inspected Mil Spec 8620 Carrier. Upper Receiver: A3 Flattop Forged 7075 T-6 Aluminum. Lower Receiver: Forged 7075 T-6 Aluminum (Diamondback Carbon). Handguard: 6" M-LOK Rail. Grip: Moe Grip. Stock: Buffer Tube Foam Pad. Magazine: 28 Round CPD. Sights: No Sights. Muzzle Device: A2 Flash Hider (5/8 x 24). Trigger: Standard Trigger. Weight: 5.1 LBS. Length: 23