Quoted:
I have a question!
Can you get the materials for that charging handle polish job you did at Home Depot or something, or am I going to have to order it online?
Yup, I got it at the Cheapo Depot. They should have the Dremel bits and the polishing compound. I actually went back and used some 400 grit sandpaper and
lightly sanded going with the grain then polished it some more and it's got a mirror finish now, although you can still see some of the tooling marks. Remember you don't want to remove the metal just polish the surface.
ETA: the blueing kit I got from Fox Ridge outfiters which is the retail store for Thompson Center Arms, just down the street from me.
I'll be updating that thread soon with a Romainian stock I'm refinishing for my brother while I'm waiting for my Ironwood stock to get here.