CMMG BANSHEE Mk4 5.7x28mm 8-Inch Armor Black

The CMMG BANSHEE Mk4 is an AR pistol presented in the listing as chambered in 5.7x28mm, with an 8-inch barrel and radial delayed blowback operating system. Its compact configuration combines a Mk4 platform with an EML7 M-LOK handguard, ZEROED controls, and a black Armor Cerakote finish.

Designed around a standard AR-style platform, this BANSHEE includes an aluminum billet upper receiver, a forged aluminum lower receiver, a CMMG ZEROED ambidextrous charging handle, a 60/90-degree safety selector, and a ZEROED drop-in single-stage trigger. The CMMG RipBrace and six-position Fastback receiver extension complete the compact configuration.

Key Specifications

• The listed caliber is 5.7x28mm.
• The barrel measures 8 inches and uses a 1:9 twist.
• The operating system is radial delayed blowback.
• The barrel is made from 4140CM SBN steel with a medium-taper contour.
• The muzzle uses a CMMG ZEROED linear compensator with 1/2x28 threading.
• The upper receiver is constructed from 6061-T6 billet aluminum.
• The lower receiver is a Mk4 forged 7075-T6 aluminum receiver.
• The handguard is a CMMG EML7 M-LOK model.
• The trigger is a ZEROED drop-in single-stage design.
• The finish is black Armor Cerakote.

With its compact dimensions, modular Mk4 architecture, and integrated ZEROED components, the CMMG BANSHEE Mk4 offers a purpose-built platform for shooters seeking a streamlined AR pistol configuration in 5.7x28mm.

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