CMMG 30AC50F-AB Dissent MK4 .300 Blackout 10.5" 31-Round AR Rifle

The CMMG 30AC50F-AB Dissent MK4 .300 Blackout 10.5" 31-Round AR Rifle represents a purpose-built platform for operators who prioritize suppressed fire capability and compact maneuverability. Chambered in .300 Blackout—the premier subsonic cartridge for sound-suppressed applications—this rifle delivers the ballistic performance and reliability demanded by law enforcement tactical teams, military special operations units, and civilian shooters requiring effective close-quarters engagement with hearing-safe ammunition. The 10.5-inch barrel strikes the critical balance between velocity retention and overall weapon length, making it ideal for room-clearing, vehicle operations, and environments where full-size rifles prove unwieldy.

CMMG's Dissent MK4 platform features a modular AR-pattern construction that accepts standard AR-15 controls and accessories, ensuring seamless integration into existing tactical inventories. The 31-round magazine capacity provides substantial firepower and sustained engagement capability without frequent reloads—a significant advantage in dynamic tactical scenarios. At 10.6 pounds, the rifle maintains reasonable weight for extended patrol or room-entry operations while delivering the rigidity and ergonomic control essential for accurate fire under stress. The dimensionally compact profile (39.6 inches overall) facilitates storage, transport, and deployment in confined spaces typical of close-quarters battle environments.

This configuration serves breach specialists, tactical entry teams, and dedicated .300 Blackout enthusiasts who have invested in suppressor systems and subsonic ammunition inventories. The AR-15 platform compatibility allows users to leverage existing optic mounts, rail accessories, and furniture without additional adaptation. Law enforcement agencies operating in urban or noise-sensitive jurisdictions particularly benefit from the inherent sound signature reduction that subsonic .300 Blackout delivers when paired with a modern suppressor—enabling effective threat neutralization while protecting officer and civilian hearing. Installation of optics, lights, and other tactical accessories follows standard AR-15 mounting conventions, making the Dissent MK4 an immediately deployable solution for units requiring suppressed intermediate-range capability.