Thanks for the tutorial on metal stressing.
Back a week ago, I acquired a Schnellfeuer 20-round magazine for a Spanish semi-auto pistol. The reference says that particular Spanish model can accept Mauser's magazine -- that's by design. I inserted the magazine into the gun, it did get in without problem, but it did not lock in the place firmly. With a little bit shaking, the magazine could drop out by itself! So it's not usable.
A little bit checking shows the triangle shaped locking lug on the magazine is very worn, so I had to return it back to the seller "it does not lock into the magazine well".
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