In case you can't watch the video, this guy was able to reproduce an accidental discharge several times by putting a tiny amount of input on the trigger and wiggling the slide. He used a screw wedged into the trigger to consistently put the trigger up to the wall so it's hard to argue human error anymore. His findings seem to indicate that if you have input on the trigger, even if it's not enough to fire, and the slide is bumped, the gun can fire (at least for his particular gun).
Hard to say how common this will wind up being since there are tens of millions of P320/M17/M18s out there. Still...more bad news for Sig, and even a one in a million chance is enough for most folks to not risk it. I have one and, while I already never considered carrying it thanks to the lack of an external safety, I'd never even risk holstering it for matches or practice now.
The evidence really seems to be pointing to a low tolerance for out-of-spec parts in the P320 design. Any gun manufacturer is going to be incentivized to cut costs over time, so that's a really bad combo.
Around 8:40 he makes a point to take measurements at rest and at the wall before including measurements that are somewhere between the two with the screw in place. I recall there being mention of the trigger only being “barely pressed”, not at the wall.
It’s definitely not very scientific, he is measuring the distance between two contoured objects with the firearm “floating” up in the air, so there’s a ton of potential for variance in those measurements.
I would have preferred to see the firearm laying flat during measurement so that we know both the tines of the caliper are against a flat surface.
It's around 7:30, he measures from the at-rest position to the wall. The screw is later put in to "barely press" into the wall. Definitely not very scientific, but I get what condition he's trying to simulate. The take-up does nothing, but when you hit the wall you are starting to put pressure on the seer. The implication here is any pressure on the seer combined with impacts to the slide can cause a discharge.
I expect there to be a flurry of videos trying to reproduce this on various 320 models. Should be an interesting week, even if the end result is bad news for Sig and 320 owners.
I get the feeling that between some of the quiet redesigns and the apparent variances in production we will be seeing a lot of "Well it works on my machine." results from people who don't get their Sig to fire like this.
I've already seen a few rabid Sig defenders making hay about the trigger being moved out of position even such a small amount being a tainted test, saying the guy who made the videos must have modified his pistol slides to rattle so much (because "it works on my machine."), or skipping past that and putting all blame on the holsters somehow.
It is clear to me that something is wrong with these pistols, and until Sig starts being honest some guy poking around at them in his garage is a better source of information than Sig's denial.
I think a big problem is that Sig has been so obtuse about the problem that basically a random guy doing garage testing has become the only public and layman friendly source of anything even approaching transparent attempts to diagnose the issue and test the diagnosis.
100%. Sig's handling of this is, without a doubt, going to be a landmark case study in how not to handle public relations. People getting communications degrees 50 years from now are going to read about it.