CMMG 30AC278TNG DISSENT MK4 .300 Blackout 10.5" Rifle

The CMMG 30AC278TNG DISSENT MK4 .300 Blackout 10.5" rifle represents purpose-built intermediate suppressed rifle design refined through law enforcement and military feedback. This platform exists to deliver subsonic performance with supersonic versatility, bridging the gap between pistol-caliber carbines and full-power rifle systems. Operators and precision shooters select the DISSENT MK4 when mission requirements demand a compact, modular rifle capable of both hearing-safe and full-power operation without reconfiguration.

The 10.5-inch barrel in .300 Blackout chambers CMMG's proprietary rifle platform, optimized for subsonic ammunition performance where velocity consistency and suppressor-ready geometry matter most. This configuration delivers superior ballistics in the subsonic envelope compared to 9mm while maintaining the ability to run supersonic loads for extended-range applications. At 9.8 pounds, the rifle achieves a balance between shootability and weight distribution, critical for sustained operation in tactical environments where fatigue directly impacts accuracy and response time. The modular design allows trigger swap, handguard reconfiguration, and optic mounting without manufacturer-specific proprietary components, ensuring compatibility with standard Picatinny and M-LOK accessories.

Law enforcement tactical teams, military designated marksmen, and professional security personnel benefit most from the DISSENT MK4's compact profile and suppressed-fire capability in close-quarters and urban environments. The 10.5-inch barrel length maintains legality and ergonomics without trading meaningful velocity, making it suitable for vehicle operations, building clearance, and support roles where full-size rifle length creates tactical disadvantage. Shooters planning suppressor integration should note the platform's threaded muzzle design and gas system tuning specifically engineered for reliable operation with sound suppressors, both hearing-safe subsonic and full-power tactical loads. Compatibility with standard AR-platform magazines and accessories means established logistics chains support this system with minimal additional investment.