CMMG Banshee 57BBCF0AB | 5.7x28mm 5in Barrel

The CMMG Banshee upper group is a compact AR-platform upper chambered in 5.7x28mm offering a lightweight, short-barrel configuration for users who want a low-recoil, fast-handling package. This upper ships complete with a bolt carrier group and CMMG ZEROED accessories and is built on a billet 6061 T6 upper receiver with a free-float M-LOK handguard. It’s suited to close-range target work and PDW-style competition or training where compact size and controllability matter.

Product Specifications

• The manufacturer is CMMG.
• The model/series is listed as Banshee Upper Group.
• The manufacturer’s part number is 57BBCF0AB.
• The caliber is 5.7x28mm.
• The barrel measures 5 inches for a compact profile.
• The barrel twist rate is 1:9.
• The barrel contour is specified as MT.
• The barrel material is listed as 4140CM SBN.
• The muzzle device is the CMMG ZEROED Linear Compensator.
• The muzzle thread is 1/2 x 28.
• The operating system is radial delayed blowback.
• The upper receiver material is billet 6061 T6 aluminum.
• The handguard is the CMMG EML4 M-LOK free-float handguard finished in Armor Black.
• The finish is listed as Cerakote (Armor Black).
• The package includes a bolt carrier group, ZEROED AR15 polymer dust cover, ZEROED AR15 ambidextrous charging handle, and the linear compensator.
• The overall reported length is 13.8 inches.
• The UPC is 810097504455.

This upper group delivers a compact, well-equipped configuration for shooters who prefer the 5.7x28mm cartridge in an AR-platform form factor. The combination of a short 5-inch barrel, M-LOK free-float handguard and the included ZEROED accessories makes it an efficient option for range sessions and PDW-style competition where maneuverability and low recoil are priorities.