CMMG Resolute MK4 Complete Upper Group – 5.56 NATO 16.1″ Black

Build or upgrade your AR-15 with the CMMG Resolute MK4 Complete Upper Group in 5.56 NATO. Featuring a 16.1-inch barrel in a classic black finish, this complete upper assembly delivers the reliability and precision engineering that CMMG is known for. Designed for shooters who demand quality components without the hassle of sourcing individual parts, the Resolute MK4 upper group is an ideal solution for new builds, replacements, or platform upgrades.

CMMG’s Resolute series is built to perform across a wide range of applications — from recreational shooting and home defense to competitive use. The MK4 platform is compatible with standard AR-15 lower receivers, making it a versatile and practical choice for a broad spectrum of firearms enthusiasts.

At Deep Roots Rifle Co, we carry a strong selection of CMMG products and can help you find the right components for your build. Whether you’re shopping online or stopping by our gun store in Eustis, Florida, our knowledgeable staff is ready to assist. Order online today for fast shipping, or visit us in store for hands-on guidance.