CMMG Banshee Upper 5.7x28mm 5″ Armor Black

The CMMG Banshee 5.7x28mm 5-inch upper group is a compact AR-platform upper designed for low-recoil, flat-shooting performance in short-barrel configurations. This upper ships complete with a billet 6061 T6 upper receiver, a free-float M-LOK handguard, and CMMG ZEROED accessories. The 5-inch barrel and radial delayed blowback operating system make it suitable for compact defensive setups and range use where maneuverability is a priority. It is configured to work with CMMG Mk57 lowers or standard AR15/Mk4 lowers when used with compatible 5.7 AR conversion magazines.

Key Specifications

• Chambered in 5.7 x 28 mm.
• The barrel measures 5 inches.
• Barrel twist is 1:9.
• Operating system is Radial Delayed Blowback.
• Barrel material is 4140CM SBN.
• Muzzle thread is 1/2 x 28.
• Muzzle device is a CMMG ZEROED Linear Compensator.
• Upper receiver is Billet 6061 T6 Aluminum.
• Handguard is a CMMG EML4 M-LOK free-float.
• Finish is Cerakote Standard with a Armor Black handguard finish.

This compact, well-appointed upper group brings a short, maneuverable profile to AR-platform builds while retaining features expected from CMMG, including a billet upper and a free-float M-LOK handguard. Its 5-inch barrel and radial delayed blowback operation make it a straightforward choice where a lightweight, compact configuration with reliable handling is desired.