CMMG 30AB20FCT Banshee MK4 .300 Blackout 12.5" 31-Round Carbine

The CMMG 30AB20FCT Banshee MK4 300 Blackout piston carbine delivers compact, highly configurable firepower purpose-built for subsonic suppressed shooting and close-quarters applications. Chambered in .300 Blackout—a caliber specifically designed for AR-platform efficiency—this 12.50-inch black nitride threaded barrel model combines velocity optimization with a 30+1 round capacity using standard Magpul magazines, making it a capable choice for specialized operators and serious enthusiasts.

The Banshee MK4 features CMMG's ZEROED matched component system: a drop-in trigger, 60/90-degree ambi safety, ambi charging handle, linear compensator, and ergonomic pistol grip that work in concert for consistent performance. The 7-inch EML handguard offers full-length M-LOK slots on both sides and bottom, plus additional M-LOK between picatinny rail sections on top, providing extensive mounting flexibility for tactical accessories. The coyote tan cerakote aluminum picatinny rail receiver balances durability with corrosion resistance—a critical consideration for suppressed/subsonic work where extended barrel times and variable environmental exposure occur. At 9.8 lbs, the platform remains maneuverable in confined spaces typical of breaching or vehicle-based operations.

This configuration suits shooters optimizing for suppressed .300 Blackout duty—whether for tactical training, specialized law enforcement applications, or advanced civilian marksmanship. The threaded barrel accommodates sound suppressors without additional adapters, and the 12.50-inch length strikes a balance between subsonic velocity potential and practical carbine handling. Operators prioritizing weapon modularity will appreciate the extensive M-LOK real estate and the familiarity of the AR-pattern controls and magazine interface.

The .300 Blackout cartridge has become standard in professional suppressed rifle programs because it reaches effective velocity from short barrels and performs reliably with both supersonic and subsonic ammunition. The CMMG Banshee platform is known in the tactical community for attention to detail—matched parts, ambi controls, and tested reliability. A 30-round Magpul magazine is included, and the threaded barrel is ready for field suppressor installation.