CMMG 30A650ACT Dissent BR4 .300 Blackout 16.1" 11-Round Carbine

The CMMG 30A650ACT Dissent BR4 .300 Blackout 16.1" 11-round carbine represents a purpose-built platform for operators who demand suppressed-fire capability without compromise. Chambered in .300 Blackout—a cartridge optimized for subsonic performance—this rifle bridges the gap between rifle ballistics and pistol-caliber ergonomics. Law enforcement tactical teams, military special operations personnel, and civilian shooters focused on hearing-safe, subsonic engagement will find this platform purpose-engineered for their mission requirements.

Built on the proven Dissent BR4 platform, this carbine balances velocity retention with modularity. The 16.1-inch barrel length optimizes .300 Blackout ballistics across both supersonic and subsonic loads while maintaining a compact overall profile ideal for vehicle operations and confined spaces. An 11-round magazine capacity provides sufficient operational capacity for most tactical scenarios, and the modular design allows for upper receiver swaps, rail systems, and optic mounting flexibility. At 11.8 pounds, the carbine remains handy enough for extended operations while delivering the terminal performance expected from a dedicated intermediate cartridge platform.

Operators selecting the CMMG Dissent BR4 in .300 Blackout gain a platform optimized for suppressed fire without sacrificing reliability or ergonomic controls. This configuration excels in close-quarters battle drills, breaching operations, and low-signature direct action. Compatible with standard AR-pattern mounting systems and accessories, the carbine integrates seamlessly into existing tactical inventories. Professional end-users—whether agency-level tactical units or experienced civilians—will appreciate the engineering focus on subsonic capability paired with modular customization.