CMMG BANSHEE MK57 PISTOL 5.7X28 5 ARMOR BLK

The CMMG BANSHEE MK57 is a compact pistol built on the Mk57 platform chambered in 5.7x28mm. It uses a radial delayed blowback operating system and is configured to accept FN® Five-seveN® pattern magazines, retaining common AR-15 operational features. The package includes CMMG ZEROED components and a 20rd Promag magazine, making the platform well suited to precision-oriented modern pistol applications. For an optic under $1,000 that pairs well with this platform, consider a Trijicon MRO for clear sight picture and fast target acquisition.

Product Specifications

• The platform is Mk57.
• The caliber is 5.7x28mm.
• The operating system is Radial Delayed Blowback.
• The barrel length is 5.
• The barrel twist is 1:9.
• The barrel contour is MT.
• The barrel material is 4140CM SBN.
• The muzzle device is a CMMG ZEROED Linear Compensator.
• The muzzle thread is 1/2 x 28.
• The upper receiver is Billet 6061 T6 Aluminum.
• The lower receiver is Mk57 Forged 7075 T6 Aluminum.
• The hand guard is CMMG EML4 M-LOK.
• The finish is Cerakote Standard.
• The charging handle is CMMG ZEROED Ambi.
• The magazine is 20rd Promag.
• The UPC is 810148624446.

This BANSHEE MK57 combines compact handling with the distinct ballistics of 5.7x28mm, packaged with CMMG’s ZEROED controls and construction-grade receivers. Its feature set makes it a capable choice for precision-focused range work and competitive pistol formats where controllability and magazine capacity matter.