Features: Platform: Br4 Caliber: 5.56x45mm Operating System: Compact Action-Direct Impingement Barrel Length: 16.1 Barrel Twist: 1:7 Barrel Contour: MT Barrel Material: 4140CM SBN Barrel Twist: 1:7 Muzzle Device: CMMG ZEROED Muzzle Brake Muzzle Thread: 1/2 x 28 Gas Port Location: Mid Gas Block: Adjustable 0.750" Upper Receiver: DISSENT 7075 T6 Aluminum Lower Receiver: Br4 Billet 7075 T6 Aluminum Hand Guard: CMMG 15" Proprietary Finish: Cerakote Charging Handle: DISSENT Side Charger - Reversible Buffer Type: N/A Stock / Brace: Magpul SGA - Remington 870 Trigger Type: ZEROED Drop-In Single Stage Trigger Guard: Integrated Safety Selector: Reversible Cross Bolt Magazine: (2) Magpul 10rd PMAG Weight: 8 lbs Length: 38.1"