CMMG 33A380C-AB Dissent MK3 8.6 Blackout 20rd 12.50" Black Nitride 7075-T6 Aluminum Receiver 11" Proprietary Handguard CMMG Zeroed Grip

The CMMG 33A380C-AB Dissent MK3 8.6 Blackout is a purpose-built rifle designed around one of the most effective intermediate cartridges in modern tactical shooting. The 8.6 Blackout builds directly on proven 300 BLK platform lessons, scaling the ballistics advantage to the larger AR10-class receiver while maintaining the subsonic suppression characteristics operators demand. With a 12.50-inch barrel and 1:3 twist rate optimized for 8.6 BLK performance, this rifle delivers significant velocity and energy from a compact package without sacrificing terminal performance or suppressor-ready functionality.

Built on a 7075-T6 aluminum receiver with black nitride coating, the platform combines weight savings with corrosion resistance critical for extended field operations. The 11-inch proprietary CMMG handguard provides adequate mounting real estate for optics, lights, and tactical accessories while maintaining a balanced profile. The rifle ships CMMG-zeroed from the factory with a grip integrated for immediate deployment. At 11.8 pounds, the Dissent MK3 8.6 Blackout strikes the balance between magazine capacity—20 rounds—and point-of-aim accuracy expected in specialized rifle roles. The 20-round capacity paired with the cartridge's ballistic advantage makes this platform effective for precision work at intermediate distances where 300 BLK remains the standard comparison.

This CMMG rifle addresses operators and serious shooters seeking the ballistic superiority of larger-bore intermediate cartridges in a suppressor-optimized platform. The 8.6 Blackout's heavier .338-caliber projectiles perform exceptionally well from shorter barrels and suppress comparably to 300 BLK while delivering increased energy on target. Users deploying AR10-platform rifles in tactical training, precision rifle competitions, or field work benefit from the specialized barrel twist and receiver dimensions engineered for this cartridge. The factory-zeroed setup reduces time to first accurate shot, a critical factor in training environments and time-sensitive applications.

The 8.6 Blackout occupies a distinct position in the intermediate rifle market: it replicates many practical advantages of 300 BLK—subsonic loading, suppressor efficiency, contained noise signature—while the larger bore and heavier bullets extend effective range and energy retention. The Dissent MK3 8.6 Blackout in black nitride represents CMMG's commitment to AR10-scaled platforms for shooters who require specialized ballistics in a tactically relevant form factor.