Start your AR10 upper build with looks and quality like no other. The CMMGMk3 upper receiver assembly, based on the DPMS LR308 gen1 high-pattern design, gives shooters an AR10-style platform with the widest range of compatible parts and accessories on the market. Each receiver comes with a CMMG ZEROEDMk3 Polymer Dust Cover pre-installed and is available in your choice of seven different Cerakote finishes.Lifetime Quality GuaranteeWe aim to please, that's why every CMMG product is backed by our Lifetime Quality Guarantee against material and workmanship defects.Learn More.