CMMG Banshee Mk3 Pistol, 8.6 Blackout, 12.5-Inch

The CMMG Banshee Mk3 (CMMG part no. 33A030CAB) is chambered in 8.6 Blackout, a big-bore round built to deliver serious downrange energy out of an AR-pattern pistol. This Banshee ships with a full slate of CMMG’s Zeroed parts standard, from the trigger to the ambidextrous charging handle, all made in the USA to a consistent standard of fit and finish. A 12.5-inch barrel and 11-inch M-LOK handguard keep the platform balanced, while the included SBA3 arm brace gives you a stable, adjustable point of contact. Finished in black, it’s a purpose-built option for shooters who want more terminal performance than 5.56 or .300 Blackout can offer in the same footprint. CMMG designed the Mk3 around AR10-pattern architecture to handle the larger cartridge.

Key Specifications

• Chambered in 8.6 Blackout, a big-bore cartridge built for heavier bullets and serious downrange energy.
• Runs a 12.5-inch barrel finished in durable black nitride for corrosion resistance.
• Wears an 11-inch M-LOK handguard for a full-length accessory mounting surface.
• Holds 20 rounds per magazine to match the larger case size of 8.6 Blackout.
• Uses a fast 1:3-inch twist rate tuned to stabilize the heavier bullets this cartridge fires.
• Includes an SBA3 arm brace for a stable, adjustable shooting platform.
• Features an ambidextrous safety selector for fast manipulation from either side.
• Ships optics-ready with no fixed sights, leaving the top rail open for a red dot or LPVO.
• Cycles in semi-auto for controlled, repeatable follow-up shots.

Frequently Asked Questions

What cartridge does the Banshee Mk3 fire? It’s chambered in 8.6 Blackout, a big-bore round designed for heavier bullets and greater downrange energy.

Does it come with a brace? Yes, it ships with CMMG’s SBA3 arm brace installed.

Is this pistol optics-ready? Yes, it has no fixed sights so you can mount a red dot or optic directly to the rail.

Buy the CMMG Banshee Mk3 Pistol, 8.6 Blackout, 12.5-Inch

For shooters who want more terminal performance than 5.56 or .300 Blackout without stepping up to a full-size rifle, this 8.6 Blackout Banshee fills that gap. CMMG’s Zeroed parts kit adds a level of refinement you don’t always find on a factory AR pistol. Order it from our AR pistols lineup at our Lubbock, Texas gun shop for fast, insured shipping to your FFL.