CMMG Banshee MK4 338 ARC 10.5″ Barrel 10rd RipBrace
Specs at a glance
About this product
The CMMG Banshee MK4 is a compact AR-style handgun platform chambered in .338 ARC designed for short-barrel performance in a pistol configuration. This MK4 model pairs a 10.5-inch 4140CM nitride-treated barrel with an MT contour and a 1:8 twist rate. It uses a direct impingement operating system and ships with a CMMG RipBrace and a single 10-round CMMG 338 ARC magazine. The Cerakote midnight bronze finish and matched CMMG ZEROED controls complete the package.
Key Specifications
- The platform is Mk4.
- The caliber is .338 ARC.
- The operating system is Direct Impingement.
- The barrel measures 10.5 inches and has a 1:8 twist rate.
- The barrel contour is MT and the material/finish is 4140CM with a nitride finish.
- The muzzle device is a CMMG ZEROED Linear Compensator with 5/8 x 24 threads.
- The gas port is located for a pistol setup and uses a non-adjustable 0.750 gas block.
- The receivers are an Mk4 billet 6061 T6 upper and an Mk4 forged 7075 T6 lower.
- The handguard is an EML9 and the finish is Cerakote (midnight bronze).
- The package includes (1) 10-round CMMG 338 ARC magazine and a CMMG RipBrace.
For shooters who prioritize a compact AR-style platform chambered in .338 ARC, the Banshee MK4 delivers a combination of short-length handling and cartridge capability. Its matched components—from the nitride barrel and linear compensator to the RipBrace and factory magazine—offer a focused, ready-to-use configuration for range work, hunting in close quarters, or other applications where a compact, high-performance pistol package is preferred.
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