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1. looks like it got caught in the recess in the bolt carrier, probably got somehow twisted during firing. inspect that area on bolt carrier for clues and/or damage
2. don't use, it is compromised
Who built your rifle? If you don't mind me asking.
I've been hearing about broken internals on Century Arms '58s from boys down south. I think there might be a big batch of sub-par quality parts floating around.