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P320 100% Failure Rate Observation and Research

This is a discussion on P320 100% Failure Rate Observation and Research within the P250 & P320 Modular Pistols forums, part of the SIG Sauer Pistols category; Never had this issue & I've shot 115 grain FMJ fully loaded. I used Barnes 9mm +p TAC-XPD rounds....


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

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Old 07-06-2015, 06:33 AM   #16
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Never had this issue & I've shot 115 grain FMJ fully loaded.

I used Barnes 9mm +p TAC-XPD rounds.
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Old 07-06-2015, 10:20 AM   #17
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Have P320 9mm Compact and I love it. Carry it 15 + 1 and shoot it at he range in the same manner. No problem and it eats all sort of ammo. With well over 500 rds shot thru it I recently had one failure to extract and this was due to light primer on a reload. But, with service ammo (Hornady Critical Duty) never ever a problem. And never any issue with Federal or Blazer. Very hardy gun and made for hard work. But, like anything mechanical, it surely will - with enough shooting and rounds fired - malfunction. That goes for the best semi autos and I only carry Sigs. That's why we train on clearing malfunctions. But, as in your case, if a gun is malfunctioning on a repetitive basis get rid of it. You cannot rely upon it to be there when you need it most. Definitely send back to Sig and they'll figure it out.
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Old 07-07-2015, 06:14 AM   #18
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This ones easy. Shoot shoot and shoot it again. The mag springs will break in and start working properly.
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Old 07-07-2015, 11:52 AM   #19
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Subcompact 12+1 9mm and not one failure in 1k rounds of freedom munitions 124gn re manufactured ammo for target and Federal HST 124+p for carry for 25 rounds.
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Old 07-08-2015, 08:13 AM   #20
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P320 full size in 9mm here. I shoot 147gr reloads and 115gf factory Perfecta through mine. I load to 17+1 and one stove pipe around 900th round. Gun was dirty, dry, and shooting reloads. I'm at 1200~ now and has been flawless since.
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Old 07-09-2015, 08:08 AM   #21
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I called Sig customer service today. They claim it is a break-in issue and recommend that I do not load 17+1 into the firearm until all the springs are broken in (I have 133 mixed rounds through the gun so far, as I did not want to keep wasting ammunition until I got ahold of Sig). Regarding the full-size range-rental gun that had the same issue, there was no comment. Sending my firearm in was not recommended at this time. Mike as customer service indicated that as manufacturers (including Sig) build tighter, more accurate, better machined firearms, some break-in on the tighter-spec pieces is inevitably going to be needed.

So, this is the impression I get:
-The P320 firearm was designed for heavy use with full power, NATO, or +P ammunition ("Any SAAMI-spec ammunition" to quote Mike from customer service). As such, it is over-spring'ed for the weakest 115gr practice loads, and while it will function shooting them (with weak ejection, as brass on my shoulder indicates), when increasing the slide resistance with a fully-loaded 17+1 round mag, the weak loads simply cannot overcome the combined recoil+magazine spring forces. This makes sense too, as the full-size gun stove-piped fiocchi rounds while the carry didn't even pull them out of the chamber. The full-size has a lighter recoil spring, reducing the resistance needed to overcome the round, thus allowing the case to extract (but still not eject).
The solutions:
1.) Buy a .357 Sig conversion. Bottlenecked cartridges + much higher baseline power = spring resistance? What spring resistance?
2.) Do not load the gun to 17+1 with weak 115gr 9mm target loads. Loading to 17+1 makes sense really for defensive use only, anyway, so considering that the 9BPLE worked great at 17+1, this should't be a problem. Still, better safe than sorry, so keeping the gun with just 17 rounds may not be a bad idea. Download reload mags to 16 rounds for easier manipulation--I do this anyway, in practice, with all mags save 1911 mags and factory P226 mags (which only have a 15 round capacity, anyway). Test a variety of loads through the firearm, from lawman to blazer to 124gr AE to NATO-spec and document the results.

It seems that while my gun is unusual in its power preferences, it isn't "broken" as such. It just really likes to be fed strong stuff.
I'm just not used to ANY Sig requiring a break-in or having ammo sensitivities. It feels weird, like I have lost a good dog.

I will update this forum as my testing proceeds over the next couple of weeks. I will try the same batch of Fiocchi with my Glock 17 gen 4 and a friend's CZ75 P-01 compact and any other 9mm I can get my hands on to determine if it is an ammunition or general platform sort of thing.

In the mean time, beware fully loading with 115gr Fiocchi FMJ!

Last edited by NWGunEnthusiast; 07-09-2015 at 08:12 AM.
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Old 07-09-2015, 02:21 PM   #22
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How about you let a friend shoot your pistol with there ammo of choice and yours all by them self . Then find out what the results are.

Did you check your mags , see if spring are in correctly and debur the followers and leave them fully loaded for a few days ??
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Old 07-10-2015, 02:14 PM   #23
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The mags are fine, smooth followers with correctly positioned springs.
I tried the carry slide on a subcompact frame and guess what? The trigger loses all tactile reset. It seems like the slide and frame doesn't align quite right. The fire control unit is also much tighter inside the subcompact frame. FYI if you want to try the compact slide/subcompact frame.

It is really unfortunate my expectations are not being met by this firearm.
Thank you all for your advice and help on this topic.
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Old 07-10-2015, 03:24 PM   #24
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I received my P320C in March 2015 and since then I've fired over 4K rounds with a total of 3 failures 2 FTE and 1 double feed. I contribute both to the shooter as I was trying different grip positions and probably limp wristed it.


The only thing that surprises me is the rental does the same thing.
Did you try shooting with just 17 in the magazine and nothing in the chamber?

This still sounds like a magazine or ammo issue. Go to a local Walmart and buy some aluminum cased Federal ammo and see what happens. They say it's the worst ammo ever but my P320C eats that stuff like candy.


I had issue with some new mags for a Taurus I owned and a local gunsmith told me to take a paint stick like you stir paint with or similar and work the springs in the magazines. I did that and my next range trip went flawlessly.

Last edited by Gofasterrrr; 07-10-2015 at 03:29 PM.
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Old 07-10-2015, 05:51 PM   #25
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I shot 7 mags of blazer aluminum and had zero issues.
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Old 07-11-2015, 06:16 AM   #26
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I just received my 320 CA model, full sized frame and compact slide and barrel. Ran mine the other day and here is my review of it's performance.

Also the range I was at there are two guys that work there have a full size and compact model and the range has a compact rental. We had an in depth discussion over the pistol and no negative issues came up. One of the instructors there has well over 4k through his without a single issues. Here is my experience with it

Well ran a few rounds through it yesterday, and first let me say the full size frame, compact/carry slide version is my favorite by far. The recoil was extremely mild, even with 124 +p duty ammo. I was quite impressed with the handing of the pistol and the recoil impulse. Second, this thing is a freaking tack driver. First magazine I rest the pistol, well just set it on the bench and hold it, to see how the POA/POI and accuracy is. I know it's not a perfect setup, but it gives me a baseline for the pistol. The first 17 rounds out this thing went literally through the same hole at 10 yards. We qualify out to 25 yards and it was easily able to keep everything in the x and 9 rings, we use a modified B-27 for quals. Everything inside the 25 was dead center.

The trigger has a slight amount of grit, but nothing earth shattering, and it will clear up with time. Reliability was 100% with three different loads, WWB 115, Win Ranger T 124 +p and Speer 124 +P GD our duty ammo. Like every pistol I plan to use for duty, out of the box I removed the slide and gave it a quick visual inspection for anything out of the norm, threw it back together and started shooting. I do not clean or lube a brand new pistol, I want to run it right out of the box. If it functions 100% under these conditions, then it will very likely work after it has been cleaned and lubed.

Sights are the Sig light NS, # 8 rear # 6 front. I was expecting a 6 o clock hold, but it shot POA/POI with all rounds. I am planning on switching to HD's as I run them on everything, but the Sig NS are just fine for most.

Overall this platform is a solid winner in my book. As I have said before I have a specific set of criteria I use to gauge duty pistols for me. So far the 320 CA seems to meet all of them as well as my Glock G19. I was so impressed with its performance that I ordered my duty holster as soon as I left the range. I will run about another 300 rounds through it before I call it good, but I see no reason why anything should pop up.

I am invested quite heavily in Glocks, so they won't be going anywhere. I will say though that most of my future purchases are going to be 320's. If your on the fence about picking one of these up, I highly recommend it. It was a pure pleasure to shoot and I could have spent all day running it.

I'm not sure about a break in, but I believe you may have a lemon. There is always going to be the possibility of a bad example with anything man made. I would stay on Sig about it. I have always found there customer service to be top notch

TXPO

Last edited by Texaspoff; 07-11-2015 at 06:22 AM.
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Old 07-11-2015, 01:49 PM   #27
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Received my new P320 9mm Carry yesterday. I did a general cleaning and lube this morning then went out to test fire. I shot 3 mags filled to 17 and without one in the chamber (16+1 essentially). The gun was fantastic. No issues. Felt great. I then tried what the OP had tried, 17+1. First shot was great but there was no extraction or even an attempt based on the position of the slide. I manually extracted the round and continued with no problems. I repeated this again with the same results. My experience is just like the OP's. I can tell you that with both of my mags, the 17th round is damn tight. Overall I shot 115 rounds and only the 2 times with 17+1 did I have an issue.
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Old 07-11-2015, 02:04 PM   #28
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Quote:
Originally Posted by flhtci2006 View Post
Received my new P320 9mm Carry yesterday. I did a general cleaning and lube this morning then went out to test fire. I shot 3 mags filled to 17 and without one in the chamber (16+1 essentially). The gun was fantastic. No issues. Felt great. I then tried what the OP had tried, 17+1. First shot was great but there was no extraction or even an attempt based on the position of the slide. I manually extracted the round and continued with no problems. I repeated this again with the same results. My experience is just like the OP's. I can tell you that with both of my mags, the 17th round is damn tight. Overall I shot 115 rounds and only the 2 times with 17+1 did I have an issue.
Once again it's not a problem. Bathe mag springs are new and very stiff. Keep shooting so the springs break in and they will work fine. Same thing we have to do with many Sigs today since everyone is trying to cram more rounds in magazines that originally held less. This leads to magazine break in time that wasn't needed in the past.
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Old 07-11-2015, 04:08 PM   #29
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I agree with twistedracer. It's the mags and like he said shoot it. Or do what I suggested and work the springs.
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Old 07-12-2015, 06:19 PM   #30
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P320 Compact

Recently purchased a p320 Compact. I didn't do a complete cleaning before the first firing which was a mistake. Just ran a few patches through the bore.

In the first 75 rounds I had about 7 feed issues of various types. After a complete cleaning and lube, including light grease the slide rails I went back to the range. The next 200 rounds all 115 gr Winchester and Federal had zero issues. Topped off mags with 15 rounds.

This is a great gun ... Very accurate and perfect for CC. Plan to get Sig 357 kit.
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