Kevin, I am not real sure how the p320 works- does the firing pin stay in train, even when it is decocked?
The P320 and M&P pistols use fully cocked strikers, the Glock is a partially loaded striker.
So to fire the P320 and M&P series all that needs to occur is the striker block is moved out of the way, the Glock requires additional rearward trigger pressure to cock it fully, and the striker block to be moved out of the way as well.
When a round is chambered in the 320, the striker is fully cocked, there is no way to decock, as all the trigger does is move the striker block out of the way.
The M&P design is closer to Glock however, as the striker block is near identical, the only major difference being the fact the striker on the Glock is pushed rearward at the same time the trigger actuates the sticker block out of the way.
If you watch the video in the article it does a very good job as showing the action of the 320 pistol.
It also shows that small dimensional issues, coating and metallurgy are extremely more of an issue in the Sig design.
IMHO it's a bad design, and anyone who shoots a lot with it, is going to have issues.
Both the FBI and USSS noted they failed significantly after 10k rounds, and where completely unusable by 15k if they had even gotten that far.
I would guess anyone who had adopted it, never did a lifecycle test on the system, or if they did, had only 1-2 guns and a low round count.
I would also hope anyone who had adopted it also does randomly picked endurance test from each delivery batch.
I used to love the SigP226, and other 22X family, but the whole P250/P320 are another animal, I have one simply as a reference gun, but it isn't carried at all.