I'm sorry, but as nasty as the stock looks, I would just grind it off. It is also touching on the glob of something under the bolt. I don't think you could tell the grinding from globs in the fiberglass and dirt in the paint. This wasn't done at McMillan.
Butch
butch, tell me what you really think!
I am thinking it should look like these
stiller predator bolt handles do in the inlet
or this