The CMMG Banshee MK4 is a compact AR-format 9mm pistol built on the Mk4 AR15-pattern lower and configured for use with CMMG 9mm AR conversion magazines. It employs a fixed ejector radial delayed blowback operating system and ships with an 8-inch barrel and CMMG RipBrace pistol brace for a compact footprint. The platform retains AR-style manual of arms and includes a CMMG EML4 M-LOK handguard with full-length Picatinny top rail sections and M-LOK slots for accessories.
Key Specifications
- Chambered in 9mm Luger for compatibility with common pistol ammunition.
- Magazine capacity is 30 + 1 using the supplied CMMG 9ARC 30-round magazine.
- The barrel length is 8 inches for a compact overall package.
- Operating system is Fixed Ejector Radial Delayed Blowback.
- Barrel twist rate is 1:10.
- Barrel material is 4140CM SBN.
- Muzzle device is the CMMG ZEROED Linear Comp.
- Muzzle thread specification is 1/2 x 28.
- Upper receiver material is Billet 6061 T6 Aluminum.
- Lower receiver material is Mk4 Forged 7075 T6 Aluminum.
Built for shooters who want a compact, AR-style 9mm pistol that maintains straightforward ergonomics and parts commonality, the Banshee MK4 pairs proven AR controls with CMMG-specific 9mm engineering. Its modular M-LOK handguard, ambidextrous controls, and RipBrace make it practical for range work and everyday transport where legal, while the robust receiver materials and CMMG-specified components support reliable use and straightforward maintenance.
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