They All Break!
Having hung around firearms for almost 60 years, I have seen a bunch of them break, too many to remember. Firing pins, strikers, extractors, ejectors and hammers are prominent in my memory, though I have never counted nor catalogued these mishaps. The common theme is impact loading. Metal parts clanging together are subject to enormous localized stresses, hence the use of fine grain metallurgy in these types of parts. Several here have maligned plastic frames. This is a red herring. The polymer frames in all of these striker fired guns are carriers for the parts doing the real work. Parts subject to impact loads have typically been fabricated from forgings or rolled stock, materials with high fracture toughness. MIM is the new kid on the block and not totally trustworthy in my opinion, but money talks.
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