CMMG BANSHEE Upper Fixed Ejector 9mm 8″ Barrel

Combining carbine-like ballistic performance and compact size, this 8" BANSHEE upper group provides a compact 9mm AR platform suitable for range use, training, and competition. It employs CMMG''''''''''radial delayed blowback operating system and a fixed ejector configuration. The upper ships complete with a bolt carrier group and ZEROED accessories including a polymer dust cover, ambidextrous charging handle, and a linear compensator.

Key Specifications

• This upper is configured for the Mk4, Mk9, Mk17 and MkGs platforms.
• Chambering is 9mm.
• The operating system is a Fixed Ejector Radial Delayed Blowback design.
• The barrel measures 8 inches.
• Barrel twist rate is 1:10.
• Barrel material is 4140CM SBN.
• The muzzle device is a CMMG ZEROED Linear Compensator with 1/2 x 28 threads.
• The upper receiver is Billet 6061 T6 Aluminum.
• The hand guard is the CMMG EML7 M-LOK system.
• The assembled upper has a listed weight of 3.0 lbs and an overall length of 16.5 inches.

Built on a billet receiver with an M-LOK hand guard and supplied ZEROED components, this upper offers a durable, modular foundation for compact 9mm carbine builds. Its combination of standard AR compatibility and accessory-ready features supports tailored setups for sport shooting, training, and other controlled-range applications.