the firing pin? that's the only screw i can think of. yes it will go in if the slots are not aligned properly, but that's not technically assembled wrong. it's just not screwed in well enough
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The firing pin, yes. I spent an hour trying to figure out why the thing wouldn't work. Everything matched another bolt I had to compare it too. It came that way from the arsenal unless someone at Dunhams was messing with it. Very simple to fix but hard to notice it as the problem.