Features: Platform: Mk4 Caliber: .338 ARC Operating System: Direct Impingement Barrel Length: 10.5 Barrel Twist: 1:8 Barrel Contour: MT Barrel Material: 4140CM Nitride Finish Barrel Twist: 1:8 Muzzle Device: CMMG ZEROED Linear Compensator Muzzle Thread: 5/8 x 24 Gas Port Location: Pistol Gas Block: Non-Adjustable 0.750" Upper Receiver: Mk4 Billet 6061 T6 Aluminum Lower Receiver: Mk4 Forged 7075 T6 Aluminum Hand Guard: EML9 Finish: Cerakote Charging Handle: CMMG ZEROED Ambi Pistol Grip: CMMG ZEROED Pistol Grip Stock / Brace: CMMG RipBrace Trigger Guard: CMMG ZEROED Trigger Guard Magazine: (1) 10rd CMMG 338 ARC Weight: 5.6 lbs Length: 26"