Sure, bolt and bolt lock mismatching could be an issue. It does not have to be the case. There are a few possibilities. On one sample that I met, hooking the bolt lock on top of the lock frame and pushing down the bolt lock, then releasing it, the lock simply does not jump up (and bolt is not even in the picture -- the bolt lock does not match the lock frame in this case). That's wrong.
I never work on those things. But for checking purpose, it's necessary to have a few methods to that can be tried externally to make sure the subject does not have obvious mechanical issues. In store and in gun show, it's not always convenient to disassemble a gun. So checking everything externally before I make an offer and asking 3-day.
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