CMMG BANSHEE MK4 300 AAC Blackout | 12.5″ | 30rd

The CMMG Banshee MK4 is a compact AR-style pistol chambered in .300 AAC Blackout with a 12.5-inch barrel and a bronze finish. It pairs a 30-round magazine capacity with a lightweight aluminum frame and polymer grip for controlled handling in a reduced-length platform. The firearm ships with a Rip Brace and is built around a Picatinny optic footprint; a red-dot such as a Trijicon MRO (under $1,000) is a practical optic choice that mounts directly to the Picatinny rail.

Common applications include precision-focused range training and small-game hunting using appropriate ammunition and local regulations. The Banshee MK4 is configured for semi-automatic operation and includes features suited to short-barreled centerfire pistol platforms.

Product Specifications

• The firearm is chambered in .300 AAC Blackout.
• The action type is Semi-Auto.
• The barrel measures 12.5 inches.
• The magazine capacity is 30 rounds.
• The package includes 1 magazine.
• The optic footprint is PICATINNY.
• The sights are listed as none.
• The frame material is aluminum.
• The grip material is polymer.
• The finish and exterior color are bronze (CeraKote Midnight Bronze).
• The barrel material is 4140 CM steel.
• The gas system length is .750 inch.
• The muzzle is threaded with 5/8×24″ threads and includes a linear muzzle device.
• The handguard is a CMMG EML11 M-LOK unit.
• The product weight is 92 ounces and the UPC is 810148623630.

This Banshee MK4 delivers the compact footprint of a purpose-built AR pistol with features intended for accurate, repeatable performance from a short-barrel platform. Its Picatinny-ready top rail and M-LOK handguard simplify mounting optics and accessories, while the included Rip Brace and CMMG Zeroed trigger emphasize controllability and a clear interface for modern sighting systems. For users seeking a shortened centerfire pistol for range work or field utility, this configuration balances capacity, ergonomics, and modularity.

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