Quote:
The grip screw holes in the frame can strip also, which is why the Army insisted that Browning put grip screw bushings in the 1911. The thread strain is shifted to the replaceable bushing so the frame is not ruined by messing up one grip screw.
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And generally that works pretty well. Does not stop idiots from stripping out the bushings from the frame (that's a real pain to fix), but it does make it a lot less likely.