CMMG Banshee Mk3 Pistol 8.6 Blackout 12.5″ 20rd

About this product

The CMMG Banshee Mk3 is a compact AR-platform pistol built on CMMG’s Mk3 (AR-10 style) chassis and chambered in 8.6 Blackout. It features a 12.50″ nitride-treated 4140CM barrel with a 1:3 twist and an 11″ M-LOK handguard for accessory mounting. The pistol uses a direct-impingement operating system and ships with a selection of CMMG ZEROED components for controls and ergonomics. Designed for compact utility, the Banshee Mk3 balances reduced overall length with a full-featured Mk3 parts set and a 20-round magazine.

Key Specifications

• The caliber is 8.6 Blackout.
• The barrel measures 12.50 inches.
• The barrel material and finish are 4140CM with Black Nitride.
• The barrel twist rate is 1:3.
• The handguard is an 11″ M-LOK CMMG EML11 style rail.
• The muzzle device is a CMMG ZEROED Linear Compensator threaded 5/8 x 24.
• The magazine capacity ships as 20 + 1.
• The action type is Semi-Auto.
• The overall weight is 7.40 lbs.
• The overall length measures 29.50 inches.

Compact and purpose-built, the Banshee Mk3 delivers Mk3-sized performance in a shorter package suitable for field use where a reduced overall length is desirable. The combination of a nitride-treated 4140CM barrel, dedicated M-LOK handguard, and CMMG ZEROED controls gives a practical baseline for customization and evolution without sacrificing core reliability or modularity.

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