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Whats the problem? Somebody here might be able to help you without having to go to a gunsmith.
Your call, but sounds like a basic op-rod dismount.
Your call, but sounds like a basic op-rod dismount. (Op rod sprung itself from the bolt lug, right?).
I'd get a $19 pair of digital calipers, mic the op rod tab (height and width) to see if it specs, and if not, send it off to Columbus Machine and have it re-bent, and the tabs rebuilt.
Basically an in-spec op rod will not dismount...(ETA: on a serviceable/non re-weld receiver).