CMMG 30AB20FSG Banshee MK4 .300 Blackout 12.5" 31-Round Rifle

The CMMG 30AB20FSG Banshee MK4 300 Blackout is a purpose-built, short-barrel platform optimized for subsonic and transonic ammunition in compact, high-control configurations. Featuring a 12.50-inch Black Nitride medium taper threaded barrel with a muzzle-ready design, this rifle delivers the ballistic advantage of .300 Blackout in a form factor that excels in close-quarters training, confined spaces, and tactical applications where maneuverability takes precedence over distance reach.

The MK4 platform integrates CMMG's ZEROED component suite—including an ambi charging handle, 60/90-degree ambidextrous safety, ergonomic pistol grip, and linear compensator tuned for 308 Winchester ballistics—delivering consistent controls for operators requiring symmetrical manipulation. The 7-inch EML free-float handguard features full-length M-LOK slots on both sides and undersides, plus M-LOK segments between top Picatinny rail sections, enabling rapid mounting of lights, lasers, and forward accessories. The Sniper Gray Cerakote aluminum receiver combines corrosion resistance with low-profile aesthetics. At 10.2 lbs unloaded, the rifle balances controllability with stability. The package includes a 30-round Magpul magazine and ships with the rifle zeroed from the factory.

This platform is purpose-built for operators, law enforcement trainers, and precision shooters who demand subsonic performance in controlled settings. The threaded barrel accommodates suppressors rated for .300 Blackout, making it suitable for noise-sensitive training environments, while the short sight radius and compact length minimize target time in dynamic drills. The MK4 .300 Blackout excels in confined-space entries, vehicle-based tactics, and precision target work where full-size rifle cartridges are inappropriate or unnecessary. Serious shooters value the Banshee platform for its ergonomics, modularity, and proven reliability across extensive duty cycles.