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Not to pick on Glock, but their mag springs definitely take on a set, and that's not with overloading, stretching, poorly maintained mags, or excessive use.
The only malfunction I've ever had with my old issue 17 was a round that tied up inside the magazine body, about an inch down.
Once I realized the springs were taking a set, I started carrying with one less than capacity for the rest of the time I carried that gun (which I still have), and started rotating mags more frequently.
I'd suggest that not all mag springs are the same in steel and durability, and some types may be more or less affected by being left fully compressed for extreme periods of time. Singlestacks may hold up longer.
Nothing to lose sleep over, I just rotate mags in any pistol I carry periodically.
My choice, and possibly a waste of time, but I don't mind.
The "creased cases" theory I've never seen or heard of. But, might be a Beretta only problem, I've never carried a full-sized Beretta.
Denis
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