The CMMG Banshee MK3 is a large-format semi-automatic pistol chambered in 8.6 BLK with a 12.5-inch black nitride barrel. It has a 7075-T6 aluminum receiver, an 11-inch M-LOK handguard, and a Zeroed grip, finished in Midnight Bronze Cerakote. Capacity is 20 rounds. 
 

Key Specifications 

• Brand: CMMG 
• Model: Banshee MK3 
• Caliber: 8.6 BLK 
• Action: Semi Auto 
• Barrel Length: 12.5" 
• Capacity: 20 
• Color/Finish: Midnight Bronze / Armor Black 
   

Detailed Features 

• 12.5-inch black nitride barrel 
• 11-inch M-LOK handguard 
• 7075-T6 aluminum upper and lower receivers 
• CMMG Zeroed grip 
• Midnight Bronze Cerakote finish

Owners of the CMMG Banshee MK3 in 8.6 BLK are typically drawn to the caliber itself, which is designed for subsonic suppressed use. The 12.5-inch pistol configuration keeps the package compact, and the Midnight Bronze finish gets frequent positive comments for appearance and durability.

The MK3 platform is larger than the MK4 or MK17 variants, and some owners note the weight is noticeable compared to smaller pistol-caliber builds. Fit and finish quality on the CMMG Banshee line is generally well-regarded, though the price premium over budget AR pistols is a recurring discussion point.

The 20-round magazine capacity is considered adequate for most use cases in this caliber, and the M-LOK handguard offers good real estate for lights and accessories. Trigger feel is serviceable from the factory but, as with most AR-platform builds, aftermarket options exist for those who want a lighter break.