It's already been said, but I'll add to it just to bolster the statement: That's normal for a Colt + It'll show more wear the first time you shoot it + it's a tool blah blah blah.
But really, Colt is known for churning out rifles with lots of "handling" marks on them. Little dings in the anodization here and there, overspray on the T marks, dings in the plastic. But they are also known for being mil-spec, reliable, and work horses.
It's the difference between buying a Stanley hammer, and a Ferrari. Did you want something to hammer nails with, or something that looks pretty in your garage?
I'm with you though, not knowing any better I would have reached out to the hive too. I think you're on the right track. Go shoot it, buy a lot of ammo and mags, and then spray paint it