CMMG MK4/AR-15 Upper Receiver Assembly – Midnight Bronze

Upgrade your AR-15 build with the CMMG MK4/AR-15 Upper Receiver Assembly in a striking Midnight Bronze finish. Engineered by CMMG, one of the most trusted names in the AR platform, this upper receiver assembly delivers the precision fit, reliable performance, and quality construction that serious shooters demand. Whether you’re completing a custom build, replacing a worn upper, or simply upgrading the aesthetics of your rifle, this assembly provides a solid foundation built to CMMG’s exacting standards.

The Midnight Bronze finish sets this upper apart from standard matte black options, offering a bold, distinctive look without sacrificing durability or function. Designed to MK4/AR-15 specifications, it offers direct compatibility with standard AR-15 components, making it a versatile choice for builders and enthusiasts across all skill levels.

At Deep Roots Rifle Co, we stock hard-to-find components like this CMMG upper receiver assembly so you can get your build done right. Order online for fast shipping nationwide or stop by our gun store in Eustis, Florida, where our knowledgeable staff is ready to help you find exactly what your build needs.