The CMMG Resolute Mk3 is a semi-automatic AR-pattern rifle chambered in 8.6 BLK with a 16.1" barrel. It has a 20+1 capacity and comes in a Midnight Bronze finish. The rifle includes the RipStock collapsible stock and ZEROED trigger. 
 

Key Specifications 

• Brand: CMMG 
• Model: Resolute Mk3 
• Caliber: 8.6 BLK 
• Action: Semi Auto 
• Capacity: 20+1 
• Barrel Length: 16.1" 
• Color/Finish: Midnight Bronze 
   

Detailed Features 

• 16.1" barrel in 8.6 BLK chambering 
• Midnight Bronze finish 
• RipStock collapsible stock 
• ZEROED trigger 
• 20+1 round capacity

Owners of the Resolute Mk3 in 8.6 BLK tend to focus on the chambering itself as the primary draw. The 8.6 BLK cartridge is purpose-built for suppressed use, and many buyers pair this rifle with a can from day one. The Midnight Bronze finish draws consistent praise for its appearance and corrosion resistance.

The RipStock and ZEROED trigger are well-received out of the box. The trigger in particular gets positive mentions for a cleaner break than typical budget mil-spec units, though serious competitors still swap it. The 16.1" barrel threads line up with suppressor use as the obvious intended application.

Some owners note that 8.6 BLK magazine compatibility and ammunition availability require planning compared to more common chamberings. The CMMG Mk3 platform is generally considered a quality build, but the Resolute sits in the middle of the CMMG lineup, and buyers looking for the full top-tier experience sometimes wish they had stepped up to the higher-tier models.