CMMG Banshee Upper 5.7x28mm 5in Armor Black

The CMMG Banshee Upper Group is a complete AR-platform upper built around a compact 5-inch barrel and chambered in 5.7x28mm. It is fitted with a CMMG EML4 M-LOK free-float handguard and a billet 6061 T6 upper receiver. The assembly ships with a bolt carrier group and ZEROED accessories and is designed to pair with CMMG Mk57 lowers or standard AR15/Mk4 lowers when used with 5.7 AR Conversion Mags.

Key Specifications

• Chambered in 5.7x28mm.
• Barrel length is 5 inches.
• Barrel twist rate is 1:9.
• Barrel material is 4140CM SBN.
• Barrel contour is MT.
• Operating system is Radial Delayed Blowback.
• Upper receiver is billet 6061 T6 aluminum.
• Handguard is a CMMG EML4 M-LOK free-float unit finished in Armor Black.
• Muzzle thread is 1/2 x 28.
• Finish is Cerakote Standard (Armor Black).

This compact upper provides a factory-complete 5.7x28mm solution for AR-platform builds that require a short, controllable barrel and a lightweight free-float handguard. The combination of a short MT-contour barrel, billet receiver and M-LOK interface creates a stable platform suitable for range use and practical defensive configurations where a compact, accurate upper is preferred.