In some instances, the firing pin can be crystalized, and without proper support upon firing...it can crack and break. With no cushion, it's a dynamic force instead of a static force. Your gun is ok though, only firing hundreds of times will hurt it...50 times won't. But you need more practice than 50 lousy times. Don't use a spent shell, it's almost worthless, and dangerous too. Practice, pratice, practice.
Hueco
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