CMMG Bolt Carrier Groups Rdb Dissent Mk4 5.7X28Mm 85BA419. 7x28mm Radial Delayed Blowback BCG for DISSENT Specifications for CMMG Bolt Carrier Group Rdb Dissent Mk4 5.7X28Mm: Manufacturer: CMMG Cartridge: 5.7x28mm Hand: Right Package Contents: CMMG...