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

The CMMG 30AB20FAB Banshee MK4 .300 Blackout 12.5" 31-round rifle represents purpose-built platform engineering for operators and shooters who demand subsonic capability with minimal signature. Designed around the inherent ballistic strengths of .300 Blackout—a cartridge optimized for suppressed fire and barrier penetration—this compact rifle excels in close-quarters tactical scenarios, home defense, and specialized military or law enforcement applications where noise and flash discipline matter. The 12.5-inch barrel length delivers the optimal velocity window for subsonic ammunition while maintaining the short profile necessary for vehicle operations, building clearance, and rapid target acquisition in confined spaces.

CMMG's Banshee platform is built on an AR-15-compatible receiver architecture, allowing the rifle to function with standard .300 Blackout magazines and offering proven aftermarket support. The 31-round magazine capacity provides intermediate firepower without the weight penalty of larger-caliber systems, while the .300 Blackout cartridge delivers superior energy transfer through intermediate barriers compared to 5.56 NATO at subsonic velocities. At 10.8 pounds unloaded, the rifle balances controllability with rapid manipulation, and the overall length of 39.6 inches keeps the package maneuverable in vehicles and tight operational environments. CMMG's quality casting and machining ensure reliability across duty cycles, and the platform's modular design supports optics mounts, suppressors (via threaded muzzle), and accessory integration without compromise.

This rifle is ideal for professional end-users—tactical teams, armed security personnel, and serious civilian preparedness buyers—who require effective suppressed-fire capability and AR-platform familiarity. The 31-round capacity and compact dimensions make it suitable for vehicle-mounted readiness, and the .300 Blackout chambering pairs seamlessly with sound suppressors to reduce report while maintaining subsonic bullet performance. Operators can integrate Picatinny rail-mounted optics and night-vision devices, and the standard AR-15 magazine well ensures rapid reloads and ammunition interchangeability. For suppressed operations where hearing protection and tactical signature reduction are operational requirements, the CMMG Banshee MK4 delivers proven platform reliability with purpose-designed ballistics.