CMMG 55AC20AAB Banshee MK4 5.56x45mm 30+1 12.50" Black Nitride Medium Taper Threaded Barrel, EML 11" M-LOK Handguards, Black Armor Cerakote Aluminum Picatinny Rail Receiver, CMMG Zeroed Grips

The CMMG Banshee MK4 5.56x45mm 30+1 12.50" Black Nitride Medium Taper Threaded Barrel carbine bridges the velocity and ballistic performance of carbine-length platforms with the compact handling characteristics operators demand in confined spaces. Built on CMMG's ultra-modular Mk4 platform, this configuration delivers the maneuverability of a short-barreled system without sacrificing 5.56mm NATO ballistic efficiency. The 12.50-inch medium taper threaded barrel supports sound suppressor mounting while maintaining practical velocity for field applications.

The handguard system features an 11-inch EML (Enhanced Modular Laminate) free-floating design with full-length M-LOK slots on both sides and bottom surfaces, plus integrated M-LOK mounting between top Picatinny rail sections. This modular architecture supports optics, tactical lights, vertical grips, and accessory rails without rail clutter. The Black Armor Cerakote aluminum Picatinny receiver provides corrosion resistance and a low-reflective finish suitable for operational environments. CMMG's ZEROED drop-in trigger and matched grip components arrive pre-configured, reducing setup time. The 30+1 round capacity with standard AR15 magazine compatibility ensures supply chain flexibility and training consistency.

This platform serves law enforcement entry teams, designated marksmen requiring compact carbine performance, and serious shooters building modular duty or training rifles. The 9.8-pound weight and compact profile suit vehicle mounting, breaching operations, and extended patrol missions where full-size carbine weight becomes fatiguing. The threaded barrel and handguard modularity allow configuration adjustments without replacing core components—a practical advantage for agencies or operators maintaining multiple duty roles.

The Banshee MK4 occupies a distinct category between AR-15 pistols and standard 16-inch carbines, offering users the ballistic performance trajectory of 5.56mm NATO in a platform optimized for close-quarters response. The modular M-LOK ecosystem ensures this rifle adapts to mission-specific configurations—from suppressed covert work to optics-heavy precision setups—without investing in multiple receivers or upper assemblies.