CMMG Banshee MK57 5.7x28mm 8" Threaded Barrel Carbine

The CMMG Banshee MK57 5.7x28mm 8" Threaded Barrel Carbine represents a purpose-built platform for shooters and operators seeking a modern, compact rifle chambered in the ballistically efficient 5.7x28mm cartridge. Developed for law enforcement, military, and civilian tactical applications, this carbine delivers reduced recoil, lower report, and exceptional accuracy in a highly maneuverable form factor. The 8-inch threaded barrel makes it ideal for suppressor integration, critical for training environments, CQB operations, and shooters prioritizing hearing protection without sacrificing velocity or terminal performance.

Built on CMMG's proven AR-pattern platform, the Banshee MK57 features a lightweight, modular design that weighs just 9.2 lbs unloaded—allowing rapid target transitions and extended operational periods without fatigue. The 1/2x28 threaded muzzle accommodates standard 5.7mm suppressors and compensators, while the compact 13.5-inch sight radius and ergonomic controls enable intuitive operation in confined spaces. The 5.7x28mm cartridge generates lower velocity than intermediate rifle rounds, reducing over-penetration risk in sensitive environments while maintaining reliable barrier performance and energy retention at tactical distances.

This carbine benefits operators in tactical training, home defense, entry teams, and civilian shooters seeking a modern AR-platform alternative to traditional intermediate calibers. The modular design accepts standard AR-15 accessories—stocks, grips, optics mounts, and rail systems—ensuring immediate compatibility with existing equipment inventories. Installation of suppressors or muzzle devices requires only hand-tightening; no gunsmith work is necessary, and the threaded barrel design allows for rapid reconfiguration based on mission requirements or training objectives.