CMMG Banshee Mk57 5.7x28mm 8in AR Pistol

The CMMG Banshee Mk57 is a semi-auto AR pistol chambered in 5.7x28mm. It uses a radial delayed blowback operating system and features an 8-inch threaded barrel, CMMG EML7 M-LOK handguard, and a black Cerakote finish.

Built on the Mk57 platform, this Banshee accepts FN Five-seveN pattern magazines and includes a 20-round ProMag magazine. Its configuration includes CMMG ZEROED controls, an ambidextrous charging handle, an integrated trigger guard, and a CMMG RipBrace.

Key Specifications

• The chambering is 5.7x28mm for compatibility with the stated cartridge.
• The action is semi-auto with a radial delayed blowback operating system.
• The barrel measures 8 inches and uses a medium-taper contour.
• The barrel is made from 4140CM steel and has a black nitride finish.
• The barrel features 1/2x28 muzzle threads.
• The handguard is a CMMG EML7 M-LOK design.
• The upper receiver is made from 6061-T6 aluminum.
• The lower receiver is made from 7075-T6 aluminum.
• The listed capacity is 20+1 rounds.
• The overall length is 23.7 inches and the listed weight is 5.2 pounds.

With its compact configuration, familiar AR-style controls, Mk57 magazine compatibility, and integrated M-LOK mounting interface, the Banshee Mk57 provides a clearly specified platform for range use and recreational shooting.

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