> "The shear amount of movement in the trigger it takes on the Glock PLUS the fact the trigger safety has to depressed lends it self to make this scenario extremely extremely unlikely to happen from jostling. Which is the exact opposite for the 320. Tiny amount of movement needed, way more slop in the gun as a whole and no trigger safety all lends itself to be way more likely to happen from jostling. Thats the argument."

The above claim is most likely true: it is easy to pull the trigger accidentally on the Sig. But that isn't the argument. People are claiming it will fire uncommanded.

The video is misleading because he is partially pulling the trigger, which deactivates the internal safety mechanisms.

It is the clickbait equivalent of a video claiming Rust is not memory safe, that starts by showing a Rust program running and causing a BSOD. Then deep in the video, what they show is he wrote a bunch of explicit unsafe code.

What do you want to bet this is a variant of some sort of light pressure against the trigger at some point in the past (including even just heavy movement!) causing a stuck trigger, plus these other issues, resulting in an uncommanded discharge ‘randomly’?

The FBI analysis showed truly terrible wear characteristics and quality control for the fire control parts which can’t be helping.

While true that it is misleading, i still think it's fundamentally correct. You do not expect your firearm to discharge if someone bumps you while the trigger has the slack taken out.

This holds true on basically every modern handgun that has such a mechanism (striker or hammer-fired).

The Sig P320 probably has more issues than the originally discovered drop-safety deficiencies, and Sig US has been very quick to deny-deny-deny. But firing when you pull the trigger is not an issue.

The glock that I used to compete regularly with basically felt like a double action revolver.

That is fairly average across the market for other handguns.

Unless you were shooting a Glock with one of the infamous NYPD 12lb triggers…

The trigger needs to be pulled a certain (very large) distance before disengaging the safety.

Pull weight might be comparable to peer weapons, but the amount of work required to disengage the safety cannot compare.

This is not a fair and accurate phrasing of the problem. Triggers have a breakpoint in the pull at which you expect them to fire. Discharging by touching the slide, even while the trigger is depressed, is not expected or acceptable.

This is not unique to the P320, Sig, or even striker-fired handguns in general. This could just as easily apply to a CZ-75B. There is no magic that keeps the striker from dropping until the shooter has their heart set on discharging a round.

There is a reason that rule #3 of firearm safety is to not put your finger on the trigger until you're ready to shoot

But there's nuance here.

They showed that with <=1mm of trigger pull (far less than the distance of the firing sequence), the weapon can be put into a state where miniscule input on the slide (consistent with typical holster carry) causes a discharge.

I'm not a firearms expert, but I very much doubt that any hammer-fired (and indeed, even the vast majority of striker-fired) weapons can be put into such a state.

Are you aware of any demonstration that shows another modern handgun being put into a state where this same amount of input on the slide can cause an actual discharge, let alone with <=1mm input on the trigger?

Yes actually. see the video I linked above: https://youtu.be/r1KoSBcn2bY?feature=shared

I wonder: do you know if there's a hammer-fired pistol which can be put into a similar state?

Modern military doctrine says that you shouldn't even pull the weapon from the holster if you don't have the intent to fire. Even if you're not quite willing to implement that (eg for LE), you shouldn't be touching/pulling the trigger without an extremely firm intent to fire.

But in the case of the demonstration in the Wyoming Gun Project video, it is literally the case that an object is being jammed into the trigger until all internal safeties are disabled, then flex and sympathetic movement is applied until the gun goes off.

There may exist a more damning explanation of what has caused the reported uncommanded discharges but that video isn’t it

If you put a few thousand rounds through either it will generate slide and frame rail wear. After this, either would have slightly more "slop" between the frame and the slide.

The glock trigger-dingus can make unintended discharges less likely because it requires an object to go into the trigger guard. But the WyomingGunProject video shows someone putting something in the trigger guard, pulling the trigger past the wall with sympathetic movement, then firing the gun. Not the result of "jostling".

This isn't to say there aren't P320's that couldn't fire uncommanded but the WyomingGunProject video is not the proverbial "smoking gun". The exact cause is, at this time, not publicly known.