Scuffed finish - CMMG Mk3 EML 11 Handguard Kit

This item arrived with the finish rubbed off in several areas, and is unfinished on the inside. You can see the unfinished silver inside through to the outside. Every time I look at the thing there is black worn off somewhere. I try to touch it up with aluminum black, but some areas don’t seem to blacken. Also, the clamp screws were so tight, the hand guard was bitten into the knurled barrel nut so tight that it was difficult to remove. I own other CMMG items that are superior quality, this item falls short.