It's gonna get dinged up anyway and those marks are there because you "did it yourself"! Take pride in the accomplishment and just learn from your mistakes!
Birchwood-Casey touch-up pen. Use the "Super Black" flat black.
With careful application you can make those small marks disappear. Use a tooth pick to apply for those tiny marks or scratches. Use the felt tip on the pen for larger areas.
Here's a pair of uppers I picked up at a swap meet for $60 for the pair. Both had marks on the shell deflector, around the ejection port, around the charging handle and just general scratches from wear and tear. Strictly cosmetic damage that touched up with a little work.
The flat top had some casting flash behind the barrel nut threads, enough that you could cut your hand if not careful. I think that's one reason the guy was getting rid of them. Took just a minute to grind the flash off and touch up, never know it was there now.
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