You need to find some one with a buffing machine to get that out. A few strokes over a buffing wheel and that will disappear. If you have a grinder you can get a cloth wheel and some rouge for it. Take the guard off the grinder and buff away.
Hey Red Hat...
I need to do the same thing to my old original 1970 Rem 870.
Would you possibly be kind enough to do an eBay or Amazon search and provide me with links for some specific polishing wheels and rouge to use on my grinder to get the minor pits out?
Thank you so much,