The CMMG Resolute MK4 is an AR-platform rifle chambered in .300 AAC Blackout, configured with a 16.1-inch medium-taper threaded barrel and a 30-round detachable magazine. It is built on CMMG’s Mk4 AR15 platform and is designed for use in shorter-barrel and suppressed setups while maintaining compatibility with common M4/AR-15 parts. The rifle comes finished in Cerakote Midnight Bronze with bi-tone metal accents and includes a Magpul 30rd PMAG. Controls and ergonomics emphasize ambidextrous operation and modularity for a variety of shooting roles.
Key Specifications
- The caliber is .300 AAC Blackout.
- The barrel measures 16.1 inches.
- The action is Semi-Automatic.
- The magazine capacity is 30 rounds.
- The overall length is 32.5 inches.
- The unloaded weight is 6.44 lbs.
- The rifling twist rate is 1:7″.
- The handguard is a CMMG EML15 M-LOK with full-length M-LOK slots on both sides and the bottom and M-LOK between top rail sections.
- The stock is a CMMG 6-position RipStock.
- The finish is Cerakote Midnight Bronze (bi-tone).
Factory features include a medium-taper 4140 CM barrel with 5/8-24″ muzzle threads and a Zeroed SV muzzle brake, a .750″ carbine gas system, a Zeroed drop-in single-stage trigger, ambidextrous controls (60/90° ambi safety, ambi mag catch, ambi charging handle), polymer dust cover, and an included Magpul 30rd PMAG. The Resolute MK4 arrives as a well-equipped AR-style rifle ready for optics and further user customization for practical shooting, suppressed-range work, or general modern sporting use.
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