Uhm, alright, so it seems the conversation is about the NDs the 320 is reportedly having. Not being a Sig user, I haven't followed it closely enough to have any idea of causal factors. While I'm aware of a single really odd ND with a Glock M22 with a WML in a duty holster, the event isn't public - another agency. I don't know how the movable chassis / changeable frames would or would not have some effect.
The Glock M22 issues I'm intimately familiar with are well known. From '00 on until '11 or '12, the Gen 3 M22 had significant function issues when a WML was attached (at least initially). The theory is that the presence of the WML impacted the speed at which the slide cycled which affected the feeding of the next round. Later, there were Gen 3 M22 pistols that displayed the same stoppage even without a light being attached. There were numerous changes to the magazine springs, the frames, the magazines, and probably more.
My old org dumped the Gen 3s for Gen 4 M22s, which then had their own different problems. We dumped those for Gen 4 9mms.
The short answer is there are no known or reported instances of P365s firing “uncommanded.”
This has already been discussed here on PF many times including at least twice in this thread.
The P365 is similar to the 320 but is not a “shrunken P320.”
The primary difference being the FCU of the P365 is a machine casting rather than a stamping and the 365 used a disconnector and lighter striker from the start.
Many of the changes incorporated into the post 2019 / current production guns, which I believe are also mechanically safe, were taken from the 365.
To my knowledge all validated instances of P320s going off without a trigger pull involve the original P320 design or original guns sent back for “upgrade.”
There is a sort of “P320 pit bull” hysteria In which any P320 ND is predjudicially presumed defective.
While the problems with the original design and some of the factory upgrade guns are real I have yet to see a validated instance of a post 2019 P320 which has been validated as going off without the trigger being pulled.
I do know that the affidavit for the lawsuit which is the subject of the original post on this thread cited two P320 NDs involving members of my agency and claimed them as “Uncommanded” discharges.
In one of those instances, that characterization is a straight up lie by the attorney who filed the affidavit. In that instance, the ND happened during agency training on a range. The shooter was witnessed putting his finger on the trigger when he should not have, the shooter admitted fault and examination of the weapon by both SIG and our agency confirmed there was nothing mechanically wrong with the weapon.
In the second instance the shooter is denying fault, and has filed their own lawsuit, however that instance also occurred during agency training, and the shooter was witnessed putting his finger on the trigger when he should not have. Again the pistol was examined by both our agency and SIG and found to have no mechanical defect. In this instance the shooter was using a personally owned SERPA holster designed for his previously issued P229R. The incident occurred on an outdoor firing range in the winter in the shooter was wearing winter gloves at the time of the incident.
Last edited by HCM; 09-14-2022 at 08:00 PM.
The P365 also has a typical spring-loaded plunger firing pin block, while the P320 has a unique-ish lever type system that is mounted to the rear of the striker assembly. Allegations against the P320, IIRC, are that the striker assembly, if rotated in the right direction, can disengage the firing pin block lever while allowing the striker lug to slip off the sear. In the second picture, that spring-loaded lever at the back of the striker assembly is the firing pin block:
https://www.midwestgunworks.com/page...prod/1300926-r
Other guns with firing pin block "lever" systems have had allegations that they are not as safe as the plungers. I think the CZ P10 had some concerns about this, I think the VP9 also has a lever system but I am not aware of concerns with that. I think their firing pin block levers are mounted to the slide, not to the striker assembly which would introduce more play into the system.
I am not an engineer and have no definite knowledge of any inherent defects with this system. But as an amateur I look at this, and other aspects of the P320, and just wonder, "why would they ever design it that way?" I do not know they are inherently flawed or anything, but to me there are way more proven systems that fill the same role and are not such odd ducks.
I would also blame a lack of quality handgun training in general. Someone keeping their finger on the trigger when they are not supposed to for sure is more likely to cause an ND with the short travel striker trigger of the M17/M18 than the long DA pull of the M9. Once saw a guy go to clear his M9 in a clearing barrel. M9 was holstered, hammer dropped, empty chamber and full mag was loaded. I watched him unholster cycle the slide, then drop the mag and pint the M9 in the barrel. Before I could stop him he pulled the trigger.
Troops transitioning from M9 to M17/18 are trying to manage the new triggers like the M9. Bad habits they had gotten away with the longer and heavier trigger now result in the "usual" NDs from fiddling, but also early shots somewhere in the drawstroke. Insufficient transition time and reps, dry and live. Less an issue in those without M9 experience (or new to handguns).
Also seen in some who ran an M9 for duty but carried striker guns CCW or on other jobs.
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