The CMMG Banshee Mk4 AR-15 Upper Group is a compact upper assembly chambered for the .338 ARC cartridge and fitted with a 10.5 inch barrel. It is built on a Mk4 billet 6061 T6 aluminum upper receiver and uses components intended to maximize parts compatibility with existing AR-15 systems. The design suits short-barrel or pistol-style configurations where a large-bore chambering in an AR platform is desired.
Key Specifications
- The platform is Mk4.
- The caliber is .338 ARC.
- The operating system is Compact Action-Direct Impingement.
- The barrel measures 10.5 inches.
- The barrel has a 1:8 twist rate.
- The barrel contour is MT.
- The barrel material and finish is 4140CM nitride.
- The muzzle device is a CMMG ZEROED Linear Compensator.
- The muzzle thread is 5/8 x 24.
- The gas block is a non-adjustable 0.750 inch unit.
This upper combines a matched barrel, muzzle device, and receiver interface to provide a ready solution for integrating .338 ARC capability into an AR-15 platform. The Mk4 billet receiver, EML9 handguard, and Cerakote finish offer a durable foundation for a compact build.
This description was generated with AI and may contain errors. Verify specifications and legal restrictions with the manufacturer before purchase. Provided “as-is” without warranties or guarantees.
