Caliber: 300 BLK - Finish: Diamondback Flat Dark Earth - Barrel: 10.5 4140 Chrome-Moly - Barrel Twist Rate: 1 x 9 - Bolt Carrier: Shot-Peened Magnetic Particle Inspected Mil Spec 8620 carrier - Lower Receiver: Forged 7075 T6 Aluminium - Upper Receiver: A3 Flattop Forged 7075 T6 Aluminum T-Marked - Handguard: Diamondback Aluminum Modified Four Rail - Pistol Grip: A2 Style - Trigger Type: Single Stage - Sights: No Sights