You're right, and I don't want to give Sig a pass, but I'm also not going to sit here and pretend that they are the only one's who have pulled some bulls****. Most of the big names have. There's not a lot of integrity left in this game.
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I believe it did in fact have a firing pin block. To my knowledge the block would get disengaged during the pretravel of the trigger.
The inertia from the fall, and the mass of the trigger, was enough to cause the trigger to move through the pre travel, and thus disengaging the firing pin block.
So I believe it had one, it was just poorly designed. If they would have put a trigger safety on it, like most other striker guns, then the whole debacle could have been avoided.
Soli Deo Gloria
My bad, I meant disconnector, which the "upgrade" included in the way of a machined notch in the slide. What I've just discovered is that there are many documented cases of 320 pistols discharging WITHOUT being dropped, most were HOLSTERED. This includes several "UPGRADED" pistols as well. I've posted a link to the lawsuit, have a read at page 27 and down.
https://bloximages.newyork1.vip.town...63c886.pdf.pdf