CMMG RESOLUTE MK4 upper group in .300 BLK with a 16.1 barrel. Includes bolt carrier group and CMMG ZEROED accessories; fits any standard AR-15 lower and features an M-LOK handguard.
The CMMG RESOLUTE MK4 Upper Group is built for .300 BLK carbine builds and intended to support both suppressed/subsonic use and standard supersonic loadings. This complete upper installs on any standard AR-15 lower and ships with a bolt carrier group and CMMG ZEROED accessory package. The assembly balances practical utility for hunting and precision target work with user serviceability and modularity.
Product Specifications
The platform is Mk4.
The caliber is .300 BLK.
The operating system is Direct Impingement.
The barrel length is 16.1.
The barrel twist is 1:7.
The barrel contour is MT.
The barrel material is 4140CM SBN.
The muzzle device is a CMMG ZEROED Muzzle Brake.
The muzzle thread is 5/8 x 24.
The gas port location is Carbine.
The gas block is 0.750 Non-Adjustable.
The upper receiver is Billet 6061 T6 Aluminum.
The hand guard is a CMMG EML15 M-LOK.
The charging handle is CMMG ZEROED Ambi.
The UPC is 810097502420.
Designed as a drop-in solution for builders and shooters who want a robust .300 BLK upper, the RESOLUTE MK4 combines CMMG components and ZEROED accessories in a single package. Its M-LOK handguard and billet receiver offer modularity for accessories, while the included muzzle device and ambidextrous charging handle simplify initial setup. For suppressed shooting and precision target work, this upper provides a practical, ready-to-fit option for a range of .300 BLK applications.
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