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

The CMMG 30AB20FCT Banshee MK4 .300 Blackout 12.5" carbine represents the evolution of subgun-class rifle design for professional operators and civilian shooters who demand suppressor-ready performance in a compact platform. Purpose-built for .300 Blackout's subsonic envelope, this 31-round carbine bridges the gap between pistol-caliber carbines and intermediate rifle systems, making it ideal for close-quarters operations, home defense, and specialized law enforcement applications where noise signature and concealability matter equally.

The Banshee MK4's 12.5-inch barrel is optimized for .300 Blackout's ballistic sweet spot, maximizing velocity from subsonic loads while maintaining inherent accuracy beyond 100 yards—critical for shooters who prioritize suppressed fire without sacrificing energy downrange. The 31-round magazine capacity, coupled with CMMG's modular design philosophy, delivers tactically relevant ammunition reserves without excessive profile inflation. At 9.8 pounds fully loaded, the platform remains controllable in tactical carbine transitions and vehicle-mounted scenarios; the compact 39.6-inch overall length ensures maneuverability through tight doorways and confined spaces where longer AR-platform rifles become liabilities. The threaded muzzle accepts industry-standard suppressors and muzzle devices, enabling shooters to tailor sound signature and recoil characteristics to mission requirements.

This carbine appeals to active-duty personnel, special operations support roles, and experienced civilian shooters who understand .300 Blackout's specialized niche—operators who run suppressed systems routinely and value ergonomic reliability over raw firepower. Law enforcement tactical teams deploying in noise-restricted environments benefit from the platform's inherent sound suppression capability when matched with quality suppressors. Installation of optics, lights, and slings follows standard AR-pattern rail systems, allowing seamless integration with existing gear ecosystems. The Banshee MK4 performs optimally with quality .300 Blackout ammunition; subsonic rounds (typically 200–240 grain) are recommended for maximum suppression benefits, while supersonic loads extend effective range when hearing protection is available.