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Discussion Starter · #1 ·
I recently purchased a new P320 XTEN. The feel of this gun in my hand is amazing! I swear it literally feels like it was molded for my hand.
It tames recoil unlike other polymer 10mm guns. It was as easy to shoot as my 5" SIG P220 10mm guns or my big 6" TRP Heavy Operator 1911.

This literally makes me sick to my stomach to say. SIG took an otherwise absolutely perfect high capacity 10mm and rendered it useless by shipping it with magazines that were NOT ready for prime time. The magazines are made in Italy by Mec-Gar and have Mec-Gar's excellent "Anti-Friction Coating", or AFC.

I really felt like my dream of the perfect high capacity 10mm had been fulfilled.
Until I started shooting something other than SIG's 180gr FMJ.

On the first outing, I forced myself to go right before the range closed and ran 50 rounds of SIG 180gr FMJ through it.
I had one failure to return to battery (FTRB). I thought it might be just stiff springs, because it was hard to load with my UpLULA, and I thought that would ease up after keeping them loaded for a week. I haven't done that yet, but as you will shortly see, it won't matter.

The magazines started indicating a problem the minute I started loading them with Underwood 180gr Bonded JHP (Speer Gold Dot bullets). I have measured the rounds with a digital caliper and found that they are well within SAAMI specs on OAL.

I was using an UpLULA to load the magazine. I was constantly hitting an invisible floor while loading. Meaning, I was having to stop, bang the mag on its back, smack the UpLULA (to the point of injuring my hand), to force the stack of rounds down to make room for the next round to be inserted.

After you get about 8 or 9 rounds in these 15-round mags, there is so much resistance to the movement of the rounds in the magazine tube (body), that you can tip the magazine over, and the top rounds fall out of the magazine! I first experienced this at the range on my second outing. I had pulled the magazine to clear a misfeed (FTRB), and I turned the magazine a little past horizontal as I was about to lay it on the bench, and five rounds fell out of the magazine!! While examining the issue at home, I discovered that there is very little room in the magazine for the rounds to move forward under recoil without contacting the front of the magazine tube.

The magazine spring, as stiff as it appears to be, is unable to push the rounds up fast enough - and not at all when rounds get jammed in the tube - to support reliable feeding.

The Mec-Gar logo.

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As can be seen in this photo, the rounds farther down in the stack are "jammed up" in the tube. I can turn this mag horizontally and rounds will fall out. You can also see that the top round, as it is oriented, is touching both the front of the tube and the rear. I've also produced situations while test-loading the mags at home, where rounds midway down the tube were jammed up, and there was a gap below them and the rounds lower in the tube. I could shake the bottom rounds up-and-down under the jammed rounds. I only had one FTRB on the first range trip shooting only SIG's 180gr FMJ, because that bullet is very rounded with a low profile and would have more room in the magazine tube.


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Spraying the interior of the tube with a Teflon dry lube and using nickel plated cases (not shown) had no noticeable positive effect. In the photo below, the rounds below are jammed up and the round on top is falling down into the tube.

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Also, even with the UpLULA, it is virtually impossible to load the 15th round. While difficult to capture in a photo, I dent the case on the 14th round trying to push it down enough to start the 15th round.
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Pictures of the follower in this magazine. Kind of odd looking.
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When the rounds stay properly oriented in the tube, there is BARELY enough room for them. Maybe 1mm in length.

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There is a phenomenon that occurs with bullets in a magazine where the top round can be properly oriented for feeding, but the round below it (second from the top) is almost horizontal. This is caused mostly by the interaction of the case rim of the top magazine with the case rim and extraction groove of the round below it. This phenomenon is most pronounced with .45ACP double stack mags, due to the size of the sloped are of the extraction groove and springs that are too weak. This misalignment leads to "nose dives" stopping the cycling of the weapon (hello P227 14-rounders). In the photo below, you cannot see the second round due to the divergence of angles between the top round and the 2nd round below it. The rounds down near the magazine catch holes appear completely horizontal with about 1mm to 1.25mm clearance between the bullet and the front of the tube.

I think the problem with these 10mm mags is that transition point when the rounds go from a proper feed angle and start to "go horizontal" in the tube. There isn't enough clearance in the tube, especially if the rounds shift at all under recoil.
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I fear SIG screwed up and didn't make the magazines large enough for anything other than their small-profile 180gr FMJ.
But maybe a modification to the follower (I don't know what kind of modification) and a different spring could fix them. I just don't know yet.

I have grown tired of SIG pushing guns out without thorough testing. They seriously need to test their products with ammo that everyone will want to use, especially for self-defense or protection in the woods.

They made an otherwise perfect gun little more than a curiosity by failing on the magazines.
Unfortunately, given SIG's complete lack of interest in fixing the 14-round magazines for the P227 (when all they needed were stiffer springs), I fear that SIG will never fix the XTEN mags. 😭

I did a quick search on the Internet to see if I was alone in this issue and instantly found that I am not.
Videos exist of others deciding, like me, that the XTEN is not worthy of staking your life on it.

Do NOT use it as a "woods gun" or for any other self-defense purpose. At least until (and if) SIG corrects the problem with the mags.
 

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Discussion Starter · #2 · (Edited)
I want to add that this is the first SIG I've handled with a straight trigger with a trigger pull that was a perfect distance for my hands. All other P320s with a straight trigger have had a trigger reach that was too long.

But, on my first outing it pinched my finger between the end of the trigger and the trigger guard and gave me a blood blister. Picture was after a few days.
I didn't even know when it happened. It was later, after I got home that I noticed the blood blister. :D

I would like to know if this gun will accept a standard curved trigger, like the one on my P320 AXG "Classic". I would like to change it. But I have to determine what to do about the damned magazine problem.

I plan to contact SIG and tell them about my experience with the magazines. I'm willing to allow them to swap the mags, but I don't think that will help because I believe there is a basic design problem with the mags. I haven't found any dealer that has mags in stock. I'm on the "notify" list at SIG Sauer's online store.

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Sorry to hear that man. Haven't shot my XTEN yet but I'm off from a funny start. Patina on the mag button and screws on the optic plate. Red as Mars. Not a killer issue just aesthetics, but I still tried to have it replaced. No-go from Sig CS. CS said XTEN parts are hard to get and are rare. CS even said it gets hot and humid at NH warehouse. Funny.
I just replaced them with my spare parts from my P320 projects to make the appearance look new. A little disappointed. I usually get replacement parts specially for brand spanking new guns without a story from Sig CS.
 

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I had problems with the Underwood JHP ammo in 9mm +P 124 grain in a Sig p365. The dimensions of the Speer bullet was causing the slide to be impossible to disengage from battery. I discovered this prior to shooting. I switched to the Underwood Lehigh ammo and the problem was resolved. I suggest you buy a box of the 10mm Underwood Lehigh ammo to see if it helps. The Underwood Lehigh ammo performance is vastly superior to any JHP ammo offering based on reaults from the 2016/17 JOINT AGENCY
BALLISTICS TEST FOR DEFENSIVE HANDGUN AMMUNITION report.

 

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Discussion Starter · #6 ·
On the first trip out, even loaded with SIG's small profile 180gr FMJ, I could not rack the slide on a fully loaded magazine. The magazine took a strong whack to seat it, and then I could not rack the slide without considerable force. From then on, I only inserted mags with the slide locked back. That is a symptom of the force it took to even get 15 rounds in the magazine. That is common with most semiautomatics of any caliber. The XTEN is just the worst example of it I've encountered.

I don't subscribe to the belief that we should just accept that a gun doesn't like certain quality defense ammo. I feel a weapon like the XTEN should reliably cycle ANY ammo that meets SAAMI specs. This ammo does meet SAAMI specs on dimensions and geometry. The only ammo that I exclude from this rule is Hornady's Critical Defense and Critical Duty. That stupid polymer plug in the tip causes all sorts of issues in many different kinds of guns. I won't use that for any reason, or in any gun.

And I don't trust the Lehigh ammo for self-defense. I feel there is far too much risk of over penetration. Especially in 10mm. Fine for a hunting round. But I wouldn't use it for defense against bipedal threats.
 

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Discussion Starter · #9 ·
I've learned to never buy a first year Sig model.
I feel like the gun is a winner - if it had good mags.
But no gun is worth much without good mags, and I really feel, based in SIG's track record on mag problems, that they just won't give a damn. They sure as hell don't listen to customers when we try to tell them they have a problem.
 

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I feel like the gun is a winner - if it had good mags.
But no gun is worth much without good mags, and I really feel, based in SIG's track record on mag problems, that they just won't give a damn. They sure as hell don't listen to customers when we try to tell them they have a problem.
A gun without mags, a revisit of the Bren ten.
 

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One first generation SIG was ok, but the designer was testing like crazy to meet military design requirements. Even then there was a recall on the MCX rifles. I've got a gen 1 that is excellent, but most gen 1s are high risk purchases until the bugs are worked out.

Thanks to GBIA for pointing out the problems on this new design. One thing that didn't have to be designed on the MCX was the magazine that was already standardized. This new pistol had no such luck and the magazine seems to have been an after thought.

Bill
 

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Or any first model from any manufacturer. They are having problems with the M&P 10 as well. I will stick with what I have and wait for them to work the bugs out.
Sorry you are having problems with it.
There have been some feeding issues reported with the 4" version. I have not heard of any issues at all with the 4.6" model and mine has been issue free so far, with a pretty wide variety of ammo over 350 rounds or so (FMJs, JHPs, FNHCs....).

But if I do develop any issues with it over time, I'll be sure to share them.
 

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Or any first model from any manufacturer. They are having problems with the M&P 10 as well. I will stick with what I have and wait for them to work the bugs out.
Sorry you are having problems with it.
I was planning on trading/selling in my Glock 20 but now I'm going to keep it for a while.
Though the XTEN is a new iteration P320, it's but P320 with a different caliber, barrel and grip module (magazine port dimension). One would think it would carry the design DNA and quality of the P320. Maybe it does.. :confused1:
 

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I am not a fan of Glocks but the two I own the Glock 19x and Glock 30 with my overwatch precision trigger makes them shootable.
I stopped being a fan of these manufacturers in general but I keep what I shoot well. S&W, Sig and Glock to top it off. I do have a G19X and G20 Gen 4. As for reliability, my S&W has given me no failures to date compared to Glock and Sig. Imagine that. :LOL:
 

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I stopped being a fan of these manufacturers in general but I keep what I shoot well. S&W, Sig and Glock to top it off. I do have a G19X and G20 Gen 4. As for reliability, my S&W has given me no failures to date compared to Glock and Sig. Imagine that. :LOL:
The MP 2.0 compact 9mm I have the rear slide plate jumps to the right a hair causing shots to go left an inch at 22ft that is a design flaw. My full size .mp pro 5" does not do that.

I am on the fence about the x10. My sig p320 full size .357sig I feel will get the job done.
 

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The MP 2.0 compact 9mm I have the rear slide plate jumps to the right a hair causing shots to go left an inch at 22ft that is a design flaw. My full size .mp pro 5" does not do that.

I am on the fence about the x10. My sig p320 full size .357sig I feel will get the job done.
I don't remember experiencing that flaw on my end. Maybe I just didn't notice it. I have replaced the read slide plate with a custom though...

My experience with the XTEN is merely aesthetic uniformity compared to @GoneBallisticInAlabama which is functional. I fixed that without Sig CS's support as they are not willing to send parts. There seem to be others here that have great experience and are very happy with the XTEN. That said, I'm taking OP's suggestion to not rely with this gun for woods or self-defense (which renders the gun meh) for now. I will shoot my gun next week, and make my own conclusion on where it seats in my armory. Range toy or weapon for attrition?
 

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I don't remember experiencing that flaw on my end. Maybe I just didn't notice it. I have replaced the read slide plate with a custom though...

My experience with the XTEN is merely aesthetic uniformity compared to @GoneBallisticInAlabama which is functional. I fixed that without Sig CS's support as they are not willing to send parts. There seem to be others here that have great experience and are very happy with the XTEN. That said, I'm taking OP's suggestion to not rely with this gun for woods or self-defense (which renders the gun meh) for now. I will shoot my gun next week, and make my own conclusion on where it seats in my armory. Range toy or weapon for attrition?
Two of my MP.2.0 9mm rear slide jumps to right, one very noticeable the other just a little. My MP pro does not. The p320 X10 caught my attention and maybe the OP got a lemon but have not come across other YouTube reviews making same claim
My .357 sig I feel is just as good at 1350fps or 1500fps with buffalo bore.
 
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