CMMG Banshee MK57 5.7x28mm Pistol 5" Barrel - AR Black Finish

The CMMG Banshee MK57 delivers the ballistic advantages of 5.7x28mm ammunition in a compact AR-platform pistol configuration. This pistol combines CMMG's proven Radial Delayed Blowback system with the flat-shooting characteristics of the 5.7x28mm cartridge for superior performance in close-quarters applications.

What Makes This Different

Unlike traditional blowback systems, the Banshee MK57 utilizes CMMG's proprietary Radial Delayed Blowback (RDB) operating system that significantly reduces felt recoil and bolt velocity. This system allows the 5.7x28mm cartridge to cycle reliably while maintaining the familiar AR-15 manual of arms. The result is faster follow-up shots and improved accuracy compared to straight blowback competitors.

Key Features

• Radial Delayed Blowback system reduces recoil by 30% compared to straight blowback designs
• 5-inch 4140 chrome moly steel barrel with 1:9 twist rate optimized for 5.7x28mm ballistics
• AR Black Cerakote finish provides corrosion resistance and durability
• Compatible with FN Five-seveN and P90 magazines for ammunition versatility
• Standard AR-15 trigger group compatibility allows for easy customization
• M-LOK compatible handguard with integrated Picatinny rail sections
• SB Tactical SBA3 pistol brace included for improved stability

The 5.7x28mm cartridge offers exceptional penetration capabilities while maintaining low recoil characteristics ideal for rapid target engagement. This combination makes the Banshee MK57 suitable for personal defense scenarios where barrier penetration and accuracy are priorities. The pistol's compact 26-inch overall length enhances maneuverability in confined spaces while the RDB system ensures reliable cycling with both SS190 and civilian 5.7x28mm ammunition types.

Technical Specs

• Caliber: 5.7x28mm
• Barrel Length: 5 inches
• Overall Length: 26 inches (with brace extended)
• Weight: 5.1 pounds (unloaded)
• Handguard: M-LOK compatible aluminum
• Finish: AR Black Cerakote
• Magazine Compatibility: FN P90/Five-seveN pattern
• Operating System: Radial Delayed Blowback
• Manufactured: United States

CMMG's engineering expertise in alternative caliber AR platforms ensures reliable function with the unique 5.7x28mm cartridge. The Banshee MK57 represents a specialized solution for users requiring the penetration and velocity characteristics of 5.7x28mm in a familiar AR-platform configuration.