The CMMG Resolute MK3 is an AR-pattern rifle chambered in 8.6 BLK with a 16.1-inch barrel. It ships with a 20-round magazine and has an Armor Black finish. The Resolute MK3 is a full-length rifle configuration compared to the shorter Banshee line. 
 

Key Specifications 

• Brand: CMMG 
• Model: Resolute MK3 
• Caliber: 8.6 BLK 
• Action: Semi Auto 
• Capacity: 20 rounds 
• Barrel Length: 16.1 in 
• Color/Finish: Armor Black 
   

Detailed Features 

• 16.1-inch barrel in Armor Black finish 
• 8.6 BLK chambering 
• Ships with one 20-round magazine 
• AR-pattern MK3 platform

Owners of the CMMG Resolute MK3 in 8.6 BLK typically compare it favorably to the shorter Banshee, citing the 16.1-inch barrel as the practical choice when suppressor length is not the primary concern. The longer barrel is generally credited with better velocity retention with both supersonic and subsonic loads.

The Resolute MK3 is often described as the more well-rounded 8.6 BLK option in the CMMG lineup. Owners who run it as a hunting or range rifle appreciate the full rifle-length configuration, though some note that the 8.6 BLK ammo supply chain remains tighter than more common chamberings.

Build quality feedback mirrors the broader CMMG MK3 platform: fit and finish are consistently praised. The Armor Black coating holds up well in field use. The main complaint from some owners is price relative to more conventional AR chamberings, with the 8.6 BLK-specific upcharge on both the rifle and ammunition factoring into long-term cost.