I see quite a few people (with various pistols) who insist on loading with the slide closed, and then get a magazine drop after firing. This is caused by not fully seating the magazine against the 1/2 round additional compression of the magazine spring, which can be verifed if the magazine does not drop when loaded from an open slide.

I believe both sides of the story: quite a few people are having trouble with magazine drops, but only a few guns have actual mechanical defects that need new parts.

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Science plus Art