CMMG Banshee MK4 | .338 ARC | 10.5″ Barrel | 10rd

The CMMG Banshee MK4 is a compact semi-automatic handgun chambered in .338 ARC with a 10.5-inch barrel and a RipBrace. It uses a direct impingement operating system and ships with a single 10-round magazine. Its configuration fits short-range precision work and range training where legal. An optic that pairs well is the Vortex Sparc AR red-dot, which supports fast target acquisition on short-barrel platforms.

Product Specifications

• The platform is Mk4.
• The caliber is .338 ARC.
• The operating system is Direct Impingement.
• The barrel measures 10.5 inches for compact handling.
• The barrel twist is 1:8.
• The barrel material and finish are 4140CM with Nitride Finish.
• The muzzle device is a CMMG ZEROED Linear Compensator.
• The muzzle threads are 5/8 x 24.
• The gas port location is Pistol.
• The upper receiver is Mk4 Billet 6061 T6 Aluminum.
• The lower receiver is Mk4 Forged 7075 T6 Aluminum.
• The hand guard is EML9.
• The stock/brace is a CMMG RipBrace.
• The package includes (1) 10rd CMMG 338 ARC magazine.
• The UPC is 840442506612.

Built with forged and billet components and a short, threaded barrel, the Banshee MK4 offers a compact, quality-focused platform for shooters who value mechanical reliability and straightforward ergonomics. Its included RipBrace and zeroed accessories make it a practical option for precision-oriented short-range shooting and legal hunting applications in jurisdictions that allow this configuration. The Banshee MK4’s materials and factory components reflect CMMG’s approach to durable, serviceable designs.

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