The CMMG Resolute Mk4 is an AR-pattern rifle chambered in .338 ARC with a 16.1-inch barrel. It carries a Midnight Bronze finish on the receiver set and components. The Mk4 designation identifies the AR receiver pattern CMMG uses for this configuration. 
 

Key Specifications 

• Brand: CMMG 
• Model: Resolute Mk4 
• Caliber: .338 ARC 
• Action: Semi Auto 
• Barrel Length: 16.1 inches 
• Color/Finish: Midnight Bronze 
   

Detailed Features 

• 16.1-inch barrel in the Resolute configuration 
• Midnight Bronze finish on receiver and components 
• Mk4 AR-pattern upper and lower receiver set 
• Chambered in .338 ARC for extended effective range over standard AR calibers

Owners of the CMMG Resolute Mk4 in .338 ARC praise the platform's ability to run a larger caliber in a familiar AR chassis. The Resolute Mk4 build quality gets consistent marks, and the Midnight Bronze finish is noted as durable and distinctive. CMMG's manufacturing quality is a recurring positive in owner feedback.

The .338 ARC chambering draws mixed reaction. Shooters who moved up from smaller AR calibers appreciate the ballistic step up, but limited ammo availability compared to more common rounds is a consistent complaint. Some find feeding and cycling more finicky than a standard 5.56 build.

Value perception splits between those who see the Resolute Mk4 as a fair price for an AR in a capable caliber, and those who question the cost relative to .308 alternatives. The Midnight Bronze finish is frequently mentioned as a reason for the purchase.