Originally Posted by Der Ami
LetFly,
Oxpho-Blue, cold blue, applied by the instructions, is as good as anything I have tried for small nicks like this. It is available from Brownells.
Mike

I agree. It probably won't go away completely, but will look much less obvious. I used some today on a rib extension on a double, where the top of the rib extension was worn through the bluing. Helped a lot.