Description
CMMG Upper Receiver Assembly, Mk4/AR15 “Tungsten”
The CMMG Mk4/AR15 55BA290 upper receiver is an excellent choice for builders who want forged strength, reduced weight, and a modern slick-side appearance. With its pre-installed dust cover and proven CMMG quality, it’s a premium starting point for a reliable custom AR15 build.
Expertly crafted from aircraft grade aluminum, CMMG Mk4/AR15 upper receiver assemblies come with our ZEROED Polymer Dust Cover pre-installed. This upper receiver omits the forward assist for those looking for a sleek and stylish base to start a new AR15 build.image
