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Exactly that began to hapen to me in my M9-A1, after using reloaded ammo. It has 4 grn of Z50 and bullet of 124 grn.

It is way too hot, and causes the primer to be blown to the slide with such a force (gas preasure) that the firing pin hole acts as a hole puncher. Not only that ... after some 15 or 20 shots, the head of the firing pin guide was broken by impact of the firing pin rear border when it was blown back by expanding gases.

After changing the firing pin guide for a new model, apparently more sturdy, I've been shoting the same ammo with no further fuzz except the holes in primers ... more or less in 25% of the shots.

Very weird!
 
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