The CMMG Resolute MK4 is an AR-15 pattern semi-automatic rifle chambered in .300 AAC Blackout with a 16.1-inch barrel and a Titanium finish. It has a 30-round capacity. The Resolute is CMMG's mid-tier AR-15 line built on their MK4 lower platform. 
 

Key Specifications 

• Brand: CMMG 
• Model: Resolute MK4 
• Caliber: .300 AAC Blackout 
• Action: Semi Auto 
• Capacity: 30 rounds 
• Barrel Length: 16.1 inches 
• Color/Finish: Titanium 
   

Detailed Features 

• 16.1-inch barrel in .300 AAC Blackout 
• Titanium finish on the receiver 
• AR-15 pattern lower platform (MK4) 
• 30-round capacity 
• Factory-finished configuration

Owners of the CMMG Resolute MK4 in .300 AAC Blackout with Titanium finish typically single out the factory finish as the main reason they chose this model over a standard matte black. The Titanium Cerakote generates consistent approval for even coverage and durability in field conditions.

The 16.1-inch barrel length is a deliberate fit for the .300 AAC Blackout cartridge, and most owners acknowledge the tradeoff between maneuverability and supersonic velocity. A common note is that the Resolute runs both supersonic and subsonic loads without drama, though individual experiences vary by ammunition brand. Trigger feel is a common upgrade point, with many owners swapping the stock trigger while keeping the rest of the build intact.

The Resolute MK4 sits above entry-level AR pricing, and opinions on that gap depend heavily on how much the Titanium finish matters to the buyer. Those who prioritize factory aesthetics tend to rate it positively. Buyers comparing raw specifications against less expensive .300 AAC AR builds are more divided about whether the CMMG premium delivers proportional value.