The CMMG BANSHEE MK4 is a compact AR-platform pistol chambered in 5.7x28mm. Built on CMMG’s Mk4 architecture, it employs a radial delayed blowback operating system and accepts standard AR15 lowers and CMMG 5.7×28 conversion magazines. The design pairs an abbreviated barrel and compact overall length with an EML-style M-LOK handguard for a modular, accessory-ready package suitable for personal defense and close-range precision use.
Key Specifications
- The caliber is 5.7x28mm.
- The platform is Mk4 AR15.
- The operating system is Radial Delayed Blowback.
- The barrel length is 8.
- The barrel material is 4140CM SBN.
- The muzzle device is the CMMG ZEROED Linear Compensator with threaded 1/2 x 28 muzzle.
- The upper receiver is Billet 6061 T6 Aluminum.
- The lower receiver is Mk4 Forged 7075 T6 Aluminum.
- The handguard is the CMMG EML7 M-LOK.
- The magazine is a CMMG 32rd and the listed weight is 4.6 lbs.
Configured with CMMG ZEROED controls and a drop-in ZEROED trigger, this BANSHEE MK4 emphasizes modularity and compatibility with AR components while offering a compact footprint for situations where a shorter platform is desired. The EML handguard and Cerakote finish support customization without sacrificing the core engineering of the Mk4 design.
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.
