07-16-2020, 01:22 PM
Klem Wrote:I wouldn't sweat it; those marks are a non-issue. They are on the forward side of the extension so will not be touching or influencing anything when the round goes off. It's just the cheap coating on that new bolt coming off and being left on other surfaces.Yep. I've decided not to worry about it. I'd feel better if it were contacting the extension face evenly all the way around rather than just on the lower half, but it doesn't strike me as a safety issue. I'll do that truing and keep on shooting.
Why do you need a GO/NO GO gauge?
And I only mentioned the headspace gauge in relation to buying a replacement/spare bolt someday. If a brand new bolt shows up in the mail, it'd be comforting to have a way to verify that it's safe to use in whatever barrel I decide to use it with. I have a Field gauge for 5.56 that I've used whenever assembling those uppers. Peace of mind.