CMMG Upper Group Resolute 57x28mm 16 1/10" Black

The CMMG Upper Group Resolute 57x28mm 16 1/10" Black is a complete rifle upper assembly purpose-built for shooters seeking personal defense weapon (PDW) ballistics paired with the ergonomic handling and balance of a modern carbine platform. The 5.7x28mm cartridge has gained significant traction in defensive and professional circles over the past decade, offering reduced recoil, minimal muzzle rise, and effective barrier penetration in a compact form factor. This upper group bridges the gap between pistol-caliber carbines and full-power rifle platforms, making it ideal for home defense, duty-carry configurations, or precision intermediate-range shooting.

Built to CMMG's exacting standards, the Resolute upper delivers consistent 57x28mm performance through a precision-machined 16 1/10-inch barrel that optimizes velocity while maintaining controlability in tactical environments. The upper assembly weighs 4.6 pounds, keeping overall rifle weight manageable for extended carry and rapid deployment scenarios where fatigue matters. The black finish provides non-reflective surface durability against corrosion and environmental exposure. The 31.25-inch overall length positions this upper as a true carbine rather than a PDW, allowing conventional stock integration and providing the sight radius and handling characteristics that trained operators demand for accuracy beyond 25 meters.

Law enforcement, private security personnel, and civilian defensive shooters will recognize the platform compatibility as a major advantage—the upper pairs seamlessly with either CMMG's dedicated Mk57 lower receiver or standard AR15 pattern lower groups, providing configuration flexibility based on mission requirements. Installation requires standard AR15 assembly knowledge and minimal gunsmithing; the upper group simply interfaces with your chosen lower via the standard pivot and takedown pins. This modular approach means shooters invested in existing AR infrastructure can rapidly transition 5.7x28mm capabilities without purchasing an entirely new platform, making the Resolute upper group an economical upgrade path for serious defensive rifle configurations.