CMMG Resolute MK4 Complete Upper Group – 300 Blackout 16.1″ Black

Upgrade your AR-15 platform with the CMMG Resolute MK4 Complete Upper Group in 300 Blackout. Chambered in the hard-hitting 300 BLK cartridge and fitted with a 16.1″ barrel, this complete upper delivers reliable performance whether you’re hunting hogs in the Florida backcountry, running suppressed at the range, or building your next precision AR build. Engineered by CMMG — one of the most respected names in the AR industry — the Resolute MK4 upper is built to exacting tolerances and designed for seamless compatibility with standard MIL-SPEC lower receivers.

The 300 Blackout cartridge is renowned for its versatility, offering excellent performance with both supersonic and subsonic loads, making it an ideal choice for hunters and suppressor users alike. This complete upper group gives you everything you need above the lower — just drop it onto your existing MIL-SPEC lower and you’re ready to go.

At Deep Roots Rifle Co, we stock hard-to-find uppers like this one and ship fast to customers throughout Florida and nationwide. Our knowledgeable staff is also available at our Eustis, Florida gun store to help you select the right build components or answer any questions about the CMMG Resolute MK4 platform. Order online today or stop by and see us in store.