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Discussion Starter · #1 ·
Comparing a standard 1911 A1 .45 firing pin to a steel 9mm firing pin designed to fit a SA 1911 .45, the mass difference between the two pins looks to be insignificant. So I would imagine that a difference in spring strength requirements, if any, would depend on the firing pin diameter.

A smaller diameter firing pin, with the same momentum force behind it, would have a higher striking pressure at the tip against the primer.

Would steel .45 pins vs steel 9mm pins (in a .45 1911) have different spring strength requirements because of this?

I realize that the spring strengths currently used by SA also involve meeting drop test requirements. My only interest here is in proper primer ignition, and also functioning equivalent to the standard 1911 A1.

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