CMMG MK4/AR15 Upper Receiver Assembly – Tungsten

Build or upgrade your AR-15 with the CMMG MK4 Upper Receiver Assembly in a striking Tungsten finish. Engineered by CMMG, one of the most trusted names in the AR platform, this stripped upper receiver is precision-machined to mil-spec standards, ensuring seamless compatibility with standard AR-15 lower receivers and components. The durable Tungsten finish adds both a distinctive, modern aesthetic and an added layer of corrosion resistance, making it an excellent choice for custom builds, upgrades, or replacement projects. Whether you’re assembling a competition rifle, a hunting build, or a dependable home defense firearm, this upper receiver provides the reliable foundation your build demands. At Deep Roots Rifle Co, we specialize in hard-to-find components and custom AR builds—our knowledgeable staff is ready to help you source every part you need to complete your project. Order online today with fast shipping nationwide, or stop by our gun store in Eustis, Florida, to see our full selection of AR-15 components and let our experts guide your next build.