Replacing FSB, how to finish bald spots
I'm replacing the FSB on my LMT upper with a low profile Troy Industries piece.
I've heard that the barrel is not finished underneath the the FSB on LMT uppers. The new gas block doesn't mount at the same locations as the FSB, so there will be unfinished metal showing on the barrel.
What is a good way to temporarily finish the bald spots? Will some gun bluing from Walmart work? The barrel will be refinished with Moly Resin in a month or so, so it will be done "right" eventually.