The CMMG DISSENT is an AR Personal Defense Weapon like no other. Incorporating a variety of new features and technologies each DISSENT is made to maximize portability and modularity most notably thanks to CMMG's patent-pending Compact Action that houses the entire recoil system in the upper receiver eliminating the need for the buffer tube altogether. - Chambered in 300 BLK this DISSENT packs .30 cal power in an ultra-compact package that offers AR15 ambi controls and our forward non-reciprocating side charger that can be switched for left or right-handed operation. At the rear of the lower receiver is a 1913 picatinny rail section for attaching the brace or stock that fits you best. - Platform: Mk4 - Caliber: .300 BLK - Operating System: Compact Action-Direct Impingement - Barrel Length: 6.5 - Barrel Twist: 1:7 - Barrel Contour: MT - Barrel Material: 4140CM SBN - Barrel Twist: 1:7 - Muzzle Device: CMMG ZEROED Linear Compensator - Muzzle Thread: 5/8 x 24 - Gas Port Location: Pistol - Gas Block: SLR Adjustable .750 - Upper Receiver: DISSENT 7075 T6 Aluminum - Lower Receiver: Mk4 Forged 7075 T6 Aluminum - Hand Guard: CMMG 5.5 Proprietary - Finish: Cerakote - Charging Handle: DISSENT Side Charger Left - Pistol Grip: CMMG ZEROED Pistol Grip - Receiver Extension: 1913 Picatinny Rail End Cap - Trigger Type: TriggerTech AR-D 2-Stage - Trigger Guard: CMMG ZEROED Trigger Guard - Safety Selector: CMMG ZEROED 60/90 Degree - Magazine: Magpul 300BLK 30rd PMAG - Weight: 4.8 lbs - Length: 14.7