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It was most likely a case of the screw not having the proper torque applied when it was installed, and simply worked its way out over time. I have seen this on a few new guns out of the box. I guess the guys just forgot to snug them up when they were being assembled.
The only other thing I can think of, is to ask if you have took the gun down, to make sure the head hasn't broken off the screw, and it's shank still threaded in the hole?
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