Just as a point of reference, when several of our officers, me included received our VUP 320's back from sig and we did exactly what you described as pulling the trigger back slightly and hitting the back of the slides with rubber mallets. We also threw the pistols on the ground several times, drug them behind a mule, and dropped them off the 20 feet onto the ground from the roof of our range. We literally beat the crap out of the pistol, because we wanted to make damn sure they wouldn't go off when dropped. We banged around and generally abused them since we were going to start carrying them again on duty. We even broke one of the frames during our testing. To be fair, we did have a glock 17 there going to the tests as well, we knew someone at the PD would ask if a Glock could do it too. It also passed with out a discharge, not surprisingly.
You know what, not a single one of the 7 guns tested slipped a striker, or discharged a primed casing without pulling the trigger. Based on that, I have no issues whatsoever carrying my 320, and neither do any of the officers here carrying them. We have been carrying them since 2018, and not a single one of them has had an issue, well one had a little rust form on the fire control unit.
As far as I know from the firearms instructors as Texas DPS, they too have not had a single un commanded discharge with any of their 2500 plus 320's. So again, until someone can prove without a doubt, and replicate the un commanded discharge on more than one correctly functioning 320, I'm simply not going to believe the pistol is flawed.
On another note, I qualified several officers from other agencies yesterday during the annual qual, and if I took some videos of them, it would be painfully clear, why some officers seems to have had ND with the 320's. I spent the entire day correcting poor handling habits and safety violations, and virtually no time actually being able to teach of train.
TXPO