The CMMG Banshee MK3 is an AR-pattern firearm chambered in 8.6 BLK with a 12.5-inch black nitride barrel. It has an 11-inch M-LOK handguard, a 7075-T6 aluminum receiver, and ships with a 20-round magazine. The Banshee MK3 includes a CMMG Zeroed grip, a stabilizing brace, and ambidextrous controls. The barrel is threaded. 
 

Key Specifications 

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

Detailed Features 

• 12.5-inch black nitride threaded barrel 
• 11-inch M-LOK handguard 
• 7075-T6 aluminum upper and lower receiver 
• CMMG Zeroed grip and stabilizing brace included 
• Ambidextrous controls

Owners of the CMMG Banshee MK3 in 8.6 BLK tend to focus on the platform's versatility with subsonic and supersonic loads. The M-LOK handguard and ambi controls get consistent praise from users who run accessories or shoot from either shoulder.

The 12.5-inch barrel length draws a range of responses. Some owners appreciate the compact profile, particularly when paired with a suppressor on the threaded muzzle. Others note that the configuration invites attention to federal transfer paperwork requirements, which catches some buyers off guard at purchase.

Build quality on the Banshee MK3 is generally well-regarded. The 7075-T6 receiver and black nitride barrel finish hold up well to regular use, though some owners note the Zeroed grip has a polarizing feel compared to aftermarket options. The 8.6 BLK chambering narrows the ammo supply chain, which comes up repeatedly in long-term ownership discussions.