CMMG Banshee MK57 5.7x28mm 20+1 Pistol

Built on the Mk57 platform, the CMMG Banshee MK57 is a compact semi-automatic pistol that accepts FN Five-seveN pattern magazines and features an oversized magazine release for intuitive operation. The design uses a radial delayed blowback operating system and ships with a full kit of CMMG ZEROED components for a consistent control feel. The package includes an M-LOK handguard, Picatinny rail atop the receiver, a threaded medium-taper nitride barrel as specified by the manufacturer listing, and a 20-round ProMag magazine.

Key Specifications

• The action is Semi-Auto.
• The caliber is 5.7 x 28 mm.
• The capacity is 20 + 1.
• The listed weight is 4.40 lbs.
• The overall length is 20.90 inches.
• The handguard type is M-LOK.
• The receiver finish is Black Armor Cerakote.
• The grip is a CMMG Zeroed grip.
• The safety is a CMMG Zeroed 60/90 Degree ambidextrous safety.
• Includes a 20-round ProMag magazine.

Compact, feature-rich, and built around the MK57 platform, this Banshee configuration delivers a practical balance of portability and accessory compatibility. Its M-LOK handguard and integrated rail sections make mounting lights and optics straightforward, while the ZEROED parts package provides a uniform control layout straight from the box. For shooters seeking a high-performance, compact pistol platform in 5.7x28mm, the Banshee MK57 offers a capable, neatly equipped option.

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