Cmmg mk4 upper - CMMG Mk4/AR15 Upper Receiver Assembly

This is an excellent upper receiver. Fit nice and snug on my lower receivers. Matches great with my Noveseke billet lower. Also, it matches perfectly with my SLR Helix handguard. The profile looks like they were built to match. If you have a handguard with anti rotation tabs, these may not work. The ejection port section matches perfectly with the V7 and FCD EPC. Minus 1/2 star because they could've done without the cutouts and design cuts. I am not a fan of them but that is just me. However, it's a nice upper with nice M4 feed ramps, barrel extension fit snug as well. No issues at all for me.