[pclmulqdq]

I think Jared's video is good at conveying the mechanics of striker-fired guns, and he is completely correct that this issue exists to some degree in every striker-fired gun (and is not an issue in them). However, the parts in the P320 have so much variance that the wall is very "mushy" on some of these guns. I wouldn't be surprised if we find that these uncommanded discharges involve both movement in the trigger and movement of the slide.

It may be the case that variance is so wide that there are some P320's which are in that "depressed to the wall" state at rest, but that would require an x-ray or CAT scan of the offending guns, and I don't know if anyone other than Sig has one. There is also a safety on P320's that should be stopping this from happening, but again, it is a part with very wide variation, and on some guns it seems it doesn't work (Sig issued a recall over this already).

I agree with Jared that this problem is a lot trickier and weirder than people give it credit for. The sort of core of the issue is that everything about the gun was done cheaply and they flew a little too close to the sun, but I believe they have no idea what in particular they cheaped out on too much.

[oflannabhra]

I understand your speculation on the amount of variance, but I haven't seen any data to support it.

Sig's "recall" was a drop-safety issue, where in certain orientations the weight of the trigger could generate enough momentum to allow an unintentional discharge.

[pclmulqdq]

There's plenty of data on the variances of P320 parts being much larger than specified by Sig, and it has been presented in a few court cases. Root causing this issue to tolerances hasn't been done, though.

[CoastalCoder]

I'm curious what the different levels of "cheaping out" saved in terms of manufacturing cost.

[pclmulqdq]

So am I. I expect that Sig doesn't know what to fix here because taking every part up to be more precise is very expensive.