The CMMG Resolute MK4 is a semi-automatic rifle chambered in 5.56x45mm NATO / .223 Rem with a 16.1" barrel, 30+1 capacity, and a Black Cerakote finish. At 5.9 lbs and 26" overall, it's a mid-weight AR-platform rifle with a few practical features built in. 
 

Key Specifications 

• Brand: CMMG 
• Model: Resolute MK4 
• Caliber: 5.56x45mm NATO / .223 Rem 
• Action: Semi-Automatic 
• Capacity: 30+1 rounds 
• Barrel Length: 16.1 inches 
• Weight: 5.9 lbs. 
• Overall Length: 26 inches 
• Finish: Black Cerakote 
   

Detailed Features 

 
The ambidextrous safety lever works for both hand orientations without modification. The single-stage trigger has a crisp break, which helps with consistent shot placement. The CMMG 6-position RipBrace stock adjusts to fit different shooter builds and shooting positions. 
 
M-Lok handguards run the length of the foreend and give you mounting points for lights, grips, and other accessories without adding much weight. The optic-ready top rail has no iron sights included, so plan to add optics. 
 

Target Audience 

 
This is a general-purpose AR-platform rifle. It works for home defense, competitive shooting, and recreational range use. New shooters will find the controls straightforward; experienced shooters will appreciate the M-Lok flexibility and Cerakote durability. 
 

Usage Scenarios 

 
Home defense is a common primary use given the 30+1 capacity and semi-auto action. At the range the 16.1" barrel provides a good balance between maneuverability and ballistic performance for 5.56. Hunters using .223 for varmints or small game will find it capable at medium ranges.

The CMMG Resolute MK4 gets solid marks from owners, with consistent feedback across a few main areas.

Build quality is the most cited positive. Users describe the construction as solid and note the Cerakote finish holds up. Cycling is reported as smooth and reliable across a range of 5.56 ammunition. Accuracy out of the box is generally described as good for the price bracket.

The 16.1" barrel length gets specific mentions from users who want the full-length buffer tube and legal barrel without going to a full 20" -- it hits a practical middle ground. The M-Lok handguards and ambidextrous controls come up positively for customization and usability.

Price is a recurring discussion point. Some owners feel it's on the higher end of the AR market for what you get stock; others point to CMMG's quality control and customer support as justification. Customer service feedback for CMMG is generally positive.

Overall the Resolute MK4 is well-regarded as a reliable, customizable 5.56 platform, with the main debate being whether the price is right relative to other options in the same category.