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Originally posted by kkina:

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I don't know what the intended function of that rear sear leg is in the design

According to Sig, the rear leg (added as part of the drop-safety upgrade) is supposed to add additional pressure from the trigger bar and help prevent the safety lever from popping up on its own.

P320 Upgrade Guide

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Originally posted by 92fstech:

The issue he seems to have found is that in a properly functioning gun, even if the sear is manually depressed, the safety lever should not move far enough to defeat the striker safety block. Apparently he has found at least one case where it does. And that shouldn't happen.

Yes he has to manually depress the sear to demonstrate the problem...by doing that he's simulating a hard impact, debris, broken springs, or some other force applied to the gun to cause the striker to disengage. Obviously nobody in any of these incidents held the gun still while somebody reached in there and poked the striker down.

The issue is that the striker interfaces directly with the trigger bar and the safety lever. Moving any one of those parts causes some movement of the others, but they are supposed to be timed so that if that movement is somehow initiated by the sear instead of the trigger, the striker will drop before the safety lever moves enough to disengage the striker safety block. He has apparently found that this is not always the case.

I have tried his test on several P320s, and none of them exhibit the behavior he is demonstrating. So clearly not all guns are affected. He also has yet to determine exactly why some guns do this and others don't, but I think that he's right about the rear leg of the sear causing the issue in the affected guns.

I don't know what the intended function of that rear sear leg is in the design, and neither does he. He took a Dremel to it as a troubleshooting step, and I can appreciate what he's trying to do, but I'm not going to do that to a gun that's going to get used in the real world, and he doesn't recommend that anyone should, either.

I'd say at this point he has come up with a compelling theory about a design issue that affects some guns and could theoretically cause a UD. He's also demonstrated that issue. I'd like to hear Sig respond with what function that rear striker leg is supposed to perform, and why the safety lever timing appears to be off in some guns but not others.

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In the "Sharp Pointy Thing" video (he says this 2 or 3 times) he has the pistol partially disassembled with the takedown lever removed and the slide slipping back and forth.
For that reason, I don't think his experiment is valid.
Seems like the TDL interfaces with the safety lever and the TDL needs to be locked into the 3:00 position before any valid testing can take place.
Why he would have taken out the TDL, I have no idea.

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Are all, or most, of these NDs occurring when holstering the pistol or are the claims of of NDs well after the physical motion of holstering is completed?

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Originally posted by gjgalligan:
I have to ask a question. Are all, or most, of these NDs occurring when holstering the pistol or are the claims of of NDs well after the physical motion of holstering is completed? Are there any NDs with the gun just laying around on a table or in a safe?
I saw the video showing the guy holstering with his trigger finger appearing to enter the holster and I wouldn't be surprised that could cause an ND.

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Originally posted by Mars_Attacks:
I've tried everything I can think of to set off both our 320 and M18 pistols. The are both bone stock and no matter how much I whack them with a plastic mallet, they won't go off.

This MUST be from modifications altering the way they work.

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Originally posted by Cous2492:

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Originally posted by RogueJSK:
[QUOTE]Originally posted by Cous2492:
Then someone demonstrates that there is, in fact a problem, as if anybody who has even a shred of objectivity couldn't see that years ago

Objectivity, by its very nature, requires facts, evidence, and proof before making a decision. Not speculation. Or a "feeling". Or an assumption. Or especially majority opinion.

Proof isn't a grainy video of an incident with an unknown cause.

Facts aren't "because somebody on the internet said so".

Evidence requires replicating the problem in a systematic manner through the use of the scientific method, which had been attempted but was elusive.

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Originally posted by 357fuzz:

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Originally posted by Cous2492:

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Originally posted by RogueJSK:
[QUOTE]Originally posted by Cous2492:
Then someone demonstrates that there is, in fact a problem, as if anybody who has even a shred of objectivity couldn't see that years ago

Objectivity, by its very nature, requires facts, evidence, and proof before making a decision. Not speculation. Or a "feeling". Or an assumption. Or especially majority opinion.

Proof isn't a grainy video of an incident with an unknown cause.

Facts aren't "because somebody on the internet said so".

Evidence requires replicating the problem in a systematic manner through the use of the scientific method, which had been attempted but was elusive.

Boy, you must really be head-over-heels for the P320 to ignore all of the reported problems plus videos showing what the problem is. Enjoy your SIG, I'll

Sorry. Had a snarky remark but, got rid of it. Let’s continue w/ good and productive discussion.

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Originally posted by trapper189:

Did you try poking it with a stick?

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Originally posted by 92fstech:

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Originally posted by trapper189:

Did you try poking it with a stick?

Thanks, that made me laugh !

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Originally posted by trapper189:

I’m honestly fascinated by the discussion. I’ve just purchased two new striker fired handguns and this discussion has me really looking at the inner workings of each.

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If you haven’t seen his signature line, then you might get another laugh out of it.

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Originally posted by MikeNH:
I want to believe that most of this is user error or faulty accessories but the governor here just signed a bill (NH House Bill 551) that shields manufacturers from certain liability lawsuits, calling out guns not having magazine disconnects, manual safeties, loaded chamber indicators and bladed triggers. Sig is obviously a huge company up here with a lot of clout. I don’t want to get all conspiratorial but man that sounds like it was worded to protect Sig from litigation.

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Originally posted by YooperSigs:
The man is a respected trainer and his take on the 320 is worthy of consideration.
However, it does not erase my concerns:
The use of MIM parts in critical FCU components.
A tabbed trigger should have been part of the design from the git.