CMMG AR15/Mk4 Upper Receiver Assembly

Expertly crafted from aircraft grade aluminum, CMMG® Mk4/AR15 upper receiver assemblies come with our ZEROED® Polymer Dust Cover pre-installed. Available in seven different Cerakote finishes, this upper receiver omits the forward assist for those looking for a sleek and stylish base to start a new AR15 build. Specifications: Platform: Mk4 / AR-15 Mil-Spec ZEROED® Polymer Dust Cover pre-installedZEROED® Polymer Brass Deflector pre-installedReceiver: Billed 6061 T6 AluminumFinish: Cerakote Armor BlackMade in the USACompatible accessories see under this article, accessories PCC Compatibility Featuring an enlarged ejection port, the CMMG Mk4 upper receiver can accomodate a variety of pistol calibers like 9mm, 10mm, .40 S&W, and .45 ACP and is compatible with CMMG MkG, MkGs, Mk10, Mk9, and Mk17 lower receivers. NOTE: This upper is not compatible with CMMG fixed ejector Radial Delayed Blowback BCGs.