You guys raise an interesting point. With that in mind ponder this. What if the firing pin isn't the issue here?
After thinking about it a bit, you are correct about the firing pin. The increased force is in the slide/barrel/frame assembly. To use an analogy, if you hit a concrete block with a 12oz ball peen you will get a different result than if you hit it with a 5lb sledge hammer.
When the muzzle impacts the concrete surface an equal and opposite force is being applied to the barrel and slide in the opposite direction correct? So could the force of the impact be driving the barrel (and the captured cartridge) back into the breechface and firing pin with sufficient force to achieve something akin to a slam fire?
"The 1911 was the design, given by God to us through John M. Browning, that represents the epitome of what a killing tool needs to be. It was true in 1911 and it's true now." - Col. Robert Coates commanding, U.S. Marine Corp Special Operations Command Detachment 1 (DET 1)
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