The CMMG Banshee MK57 is an AR-style pistol built on the Mk57 platform and chambered in 5.7x28mm. It features an 8-inch Black Nitride medium-taper threaded barrel and operates using a radial delayed blowback system. The Banshee accepts FN Five-seveN pattern magazines and ships with a 20-round ProMag; a full kit of CMMG ZEROED components is installed for ambidextrous control and ergonomics.
Key Specifications
- Chambered in 5.7x28mm for use in compact AR-style pistol platforms.
- Barrel length is 8 inches with a medium taper nitride finish and 1/2×28 threads.
- Operating system is Radial Delayed Blowback for reliable cycling with the platform.
- Magazine capacity is 20+1 and the pistol accepts FN Five-seveN pattern magazines.
- Included magazine is a 20rd ProMag.
- Barrel material is 4140CM SBN with a 1:9 twist rate.
- Muzzle device is a CMMG ZEROED Linear Compensator threaded 1/2×28.
- Handguard is a CMMG EML7 M-LOK with full-length M-LOK slots in key positions.
- Overall weight is approximately 5.2 lbs.
- Overall length measures 23.7 inches with the CMMG RipBrace installed.
The Banshee MK57 combines compact dimensions and an FN Five-seveN magazine form factor with CMMG’s Mk57 platform features: billet upper and forged lower receivers, ZEROED ergonomics and controls, and an M-LOK accessory interface. Its configuration suits range use, compact defensive applications, and shooters who prefer a high-capacity, lightweight AR-style pistol chambered in 5.7x28mm.
Product information is supplied by the manufacturer and/or distributor and may be automatically formatted or enhanced using AI for clarity and consistency. While we strive for accuracy, specifications, features, and included items may change without notice. Always verify details using the manufacturer’s official documentation and the information shown on this product page before purchase or use.
Related Videos:
