CMMG 30AB20FAB Banshee MK4 .300 Blackout 12.5" 31-Round Rifle

The CMMG 30AB20FAB Banshee MK4 .300 Blackout 30+1 represents a purpose-built platform engineered specifically for suppressed and subsonic rifle applications. Featuring a 12.50-inch black nitride medium taper threaded barrel and 7-inch EML M-LOK handguard, this 10.8-pound firearm delivers the compact form factor demanded by operators running integrally suppressed or dedicated can setups while maintaining the ergonomic familiarity of AR15-platform controls.

.300 Blackout was purpose-designed for AR15-pattern firearms, and the MK4 platform leverages that compatibility through a black armor cerakote aluminum receiver and picatinny rail configuration. The 7-inch EML handguard features full-length M-LOK slots on both sides and bottom, plus M-LOK stations between top rail sections, enabling rapid accessory configuration for optics, lighting, and tactical equipment. The included CMMG ZEROED components—60/90 degree ambidextrous safety, ambidextrous charging handle, drop-in trigger, polymer dust cover, linear compensator (308 Winchester), and ZEROED pistol grip—eliminate the need for secondary assembly and tuning, allowing deployment straight from the box. One 30-round Magpul magazine ships with the rifle.

This platform serves shooters who prioritize suppressed fire, whether for tactical training, precision work with subsonic ammunition, or duty roles where hearing protection and signature reduction matter. The medium taper barrel profile balances weight savings with vertical stiffness, critical when running sound suppressors that introduce both mass and harmonic frequency shifts. Ambidextrous controls accommodate both right and left-handed operators, and the threaded barrel allows muzzle device configuration based on suppressor compatibility or muzzle brake preference. At 39.6 inches overall length, the Banshee MK4 fits roles where compactness and maneuverability are essential without sacrificing the modular ecosystem of full-size AR platforms.

.300 Blackout remains the preferred intermediate cartridge for suppressed precision and close-quarters work within AR15-platform rifles. The CMMG Banshee MK4 ecosystem—already configured with professional-grade parts—appeals to shooters, law enforcement units, and military personnel seeking a turn-key platform that requires minimal additional investment or customization to achieve reliable subsonic performance.