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Solved my P320 trigger issue (maybe for you too)

This is a discussion on Solved my P320 trigger issue (maybe for you too) within the P250 & P320 Modular Pistols forums, part of the SIG Sauer Pistols category; So I recently acquired two P320's. One is a Compact 9mm, the other is a full size 9mm. The full size 9mm was brand new ...


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P250 & P320 Modular Pistols P250, P320, and Exchange kits

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  • 6 Post By ruchik
  • 2 Post By GoneBallisticInAlabama
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Old 01-03-2017, 04:38 PM   #1
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Solved my P320 trigger issue (maybe for you too)

So I recently acquired two P320's. One is a Compact 9mm, the other is a full size 9mm.

The full size 9mm was brand new old stock and unfired. Everything was perfect until I bought a small, compact grip module. When I placed the FCU into the frame, and seated it fully against the back of the grip, something was dragging on the trigger bar and causing the gun to have a monstrously slow and sluggish reset. I initially thought that perhaps it was the trigger bar dragging on the frame. Nope, that wasn't it. Then I thought maybe the grip was too narrow for the FCU? That didn't make any sense either.

When I picked up the Compact 9mm, I immediately swapped in another small grip module, and I had absolutely no issues with reset, or feeling like the trigger bar was dragging on something. Odd. I swapped in the problematic FCU, and there was the problem again. So I knew it wasn't the frame's fault, there was something going on with the FCU.

I said screw it, and ended up destroying one frame getting to the root of the problem. I ended up dremeling away a tiny bit of the frame where it contacts the trigger bar spring; specifically the loops of the trigger bar spring, where it hangs under the FCU. This is what I found:


As you can see here, the vertical leg of the trigger bar spring sits right at the rear corner of the trigger bar.



When the trigger is pulled all the way to the rear, that vertical leg of the spring gets caught behind the trigger bar, causing the trigger to either crawl back forwards, or completely hang up as a dead trigger, like so:




I believe this is the root of all the complaints regarding P320's failing to reset, getting a dead trigger, or having a sluggish reset. I am positive this is the issue, because when I looked at my later production date P320, this is what I see:



Notice that the back corner/edge of the trigger bar is beveled, thus preventing the vertical leg of the trigger spring from ever catching behind it. I don't know why Sig didn't point this out (as far as I can tell) that this was a design change along with all the other updates (smaller slide stop, Adverse trigger, flat takedown lever, etc.).

If you're having problems with your P320 trigger, especially when going from a large or medium grip module down to a small, take a look at your trigger bar and spring.
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Last edited by ruchik; 01-03-2017 at 04:41 PM.
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Old 01-03-2017, 04:55 PM   #2
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Interesting. I have the original 320 FCU and I've never had one issue with my trigger changing out medium to small I'm either the compact or sc size. Something to I'll note if this ever happens.
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Old 01-03-2017, 05:05 PM   #3
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Quote:
Originally Posted by ruchik View Post
... I don't know why Sig didn't point this out (as far as I can tell) that this was a design change along with all the other updates (smaller slide stop, Adverse trigger, flat takedown lever, etc.). ....
SIG is pretty determined to NEVER willingly admit to a problem.

They don't want people to start flooding them with demands to update the parts.

They had rather you wait to see if you actually have a problem...and hopefully not die in the process.
P229R and bumper like this.
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Old 01-03-2017, 05:13 PM   #4
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From my limited 9 years experience, SIGs doesn't often announce "minor" problems and fixes. When enough failures occur, they quietly make the fix or change and move on. If you call customer service to ask, you may end up thinking you are the first and only person to have ever experienced this particular problem. Almost the telephone equivalent of a blank stare. Official recalls happen when a defect could result in an inadvertent discharge.

Without a forum like this, we'd mostly be clueless - or more clueless, depending on your frame of reference.
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Old 01-03-2017, 05:20 PM   #5
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I still haven't addressed the pin that is too short in the FCU of my Wife's P320 Compact 9mm. I should send it in and demand they fix that as well.
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Old 01-03-2017, 07:06 PM   #6
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Nice detective work.

Man...the more time goes by, the luckier I feel that my initial P320C in 9mm has been absolutely flawless over 5K+ rounds.
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