CMMG Upper Group Banshee MK4 .22LR 4.5" Barrel Black

The CMMG Upper Group Banshee MK4 .22LR 4.5" Barrel Black delivers authentic AR-pattern rifle performance in a rimfire caliber, purpose-built for shooters who demand genuine .22 LR handling without compromise. This upper receiver group is engineered on CMMG's proven Mk4 platform, making it compatible with any standard AR15 lower receiver and purpose-designed CMMG .22 AR conversion magazines. At 4.5 inches, the barrel length is the shortest option CMMG offers across any caliber, enabling compact overall dimensions while maintaining adequate sight radius for precision aiming.

Every upper group arrives fully assembled with bolt carrier group and CMMG ZEROED accessories, including an AR15 polymer dust cover. The 4.5-inch barrel is optimized for .22 LR ballistics, delivering velocity and accuracy suitable for training, small-game hunting, or high-volume recreational shooting. The compact barrel profile minimizes overall length—critical for operators and enthusiasts building vehicles, off-duty, or crowded-space configurations. Black hard-coat anodized finish resists corrosion in field conditions while maintaining the professional AR aesthetic across your platform.

This upper suits shooters seeking low-recoil practice alternatives without sacrificing controls familiarity, competitors training between centerfire events, and budget-conscious operators running high round counts. The Banshee platform's design means trigger control, safety manipulation, sight picture, and malfunction-clearing protocols remain identical to centerfire AR-15 systems, eliminating skill crossover friction. At 2.62 pounds, the upper adds minimal weight to AR builds, preserving balance and maneuverability across various lower receiver configurations and stock profiles.

CMMG's .22 LR lineup has become the go-to choice for rimfire shooters serious about maintaining AR ergonomics and mechanical consistency. The Banshee MK4 upper integrates seamlessly into existing AR ecosystems, making it ideal for multi-caliber builds or dedicated training rigs. With ZEROED accessories pre-installed and the barrel pre-threaded where applicable, setup time is minimized—functionality arrives ready to mount, configure, and deploy.