Review of cmmg mk4/ar15 upper receiver assembly - CMMG Mk4/AR15 Upper Receiver Assembly

This is the second CMMG upper I've purchased. The first one was for a Mk17 build. I was not impressed with the Cerakote finish. That'ssomething CMMG needs to do. I hoping the new was is better. I built a MKG glock Pistol with my new upper. I haven't taken it to the range yet, but I have no doubt it will perform well. I was very satisfied with my MK17. I've also used the upper with the 9mm Conversion kit/mags. I must say it's a most versatile upper.