SIG SAUER P320-XTEN Comp 10mm pistol
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If you’ll be out in the woods this fall, SIG SAUER just announced a new optic-ready compact 10mm pistol that will be a very convenient and effective option when encounters with large four-legged critters are a possibility. It would also do quite well, of course, against two-legged predators.

Here’s SIG’s press release . . .

Introducing the P320-XTEN COMP

Maximum capacity and shootability in an ultra-compact design for peace of mind on your next backcountry adventure.

SIG SAUER P320-XTEN Comp 10mm pistol

The P320-XTEN COMP is the first carry-length P320-XTEN from SIG SAUER, and it incorporates slide-integrated compensation for the ultimate 10MM carry package ideally suited for backcountry hunters, hikers and fisherman.

SIG SAUER P320-XTEN Comp 10mm pistol

The XTEN slide is the equivalent length of a 4.25” barrel but is instead equipped with a single port compensator integrated into the slide and paired with a 3.8” bull barrel that allows for maximum shootability.

P320-XTEN COMP Features:

• Single Port Slide-Integrated Expansion Chamber for Recoil Mitigation
• All-New XSeries Carry Length Grip Module
• XSeries Flat Trigger with 90-degree break
• (2) 15rd Steel Magazines
• XRAY 3 Day/Night Sight

MSRP: $949.99


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  1. I’ve been toying with the idea of a 10mm lately, but that 3.8″ barrel seems way too short to get the ballistics I want in the field. Think I’ll hold out for a 5″ 1911.

    • 10 does a lot better with shorter barrels than one would expect. With that said for smaller guns I tend towards 9/40/357(either one)

    • Im interested in taking the 10mm plunge myself but Yea just seems like not enough bbl for a 10. Having never shot one I really have nothing to base that on though.

      • Go with the full size Ten instead then if you’re set on this line. Threaded barrel addition usually tacks on .7″ length bringing barrel length to 5″. Not up on the product availability for this model, but if a comp is desired, a dedicated design is far more effective than these half stepper compensated slides. No oversized expansion port to reduce pressure like this one, making it less efficacious.

        In terms of concealed; I find a dedicated comped (longer slide effectively) is more comfortable for carry while being less prone to tilt. Married to a 15 – 17 rd. double stack capable grip is pretty much perfect for casual edc.

        Bit of an exaggeration saying these are optimal for back country with a 3.8″, in part agreed. Having said that, I am completely unswayed. Don’t think I’ll be replacing my Rowland powered FNX-Tee, best mm is weak sauce compared and contrasted to.

        • The comp design for this one is much more relevant in restricted states where threaded barrels can be an issue. With that said bit envious of the Rowland as the best legal option we have is a custom length barrel with the comp cut into the barrel with availability wait time only measured in months (7is last time I looked) for the Glock 21/41 options.

        • I am aware of the legit reasons they exist, and also fortunate to not live in an area where it’s a concern. No critique leveled at those where this is the best option without a fight in court.

          Also know there is a lot of undue hype around these integrally comped models from the general populace, and a few are taking advantage of this. Fewer still are advising pumping the brakes and casting a more critical eye over the concept, and it surely need be said.

          As for Rowland, solely one thing that will regret it and that is the wallet. 😉

        • Besides being a reloaders round (outside of a few options) any issues? And yeah outside of necessity the frame mounted and barrel milled comps do seem suboptimal.

        • Ugh, Cloudflare ate my reply. Got a practice session scheduled for function test, possible swap to Ranger One, in an hour. Don’t have time to redo rn. Revisit tomorrow.

        • So issues, yeah nope. None. From the technical side; 2.1k of actual Rowland through her, total round count being 4340 by my logs. 8 years owned. Showing nil for discernible chamber erosion. Head space is nearly unchanged from factory spec, and she was blue printed a little over a year ago.

          With that, a fair amount of was full power Buffalo and Underwood. I do train with what I carry a bit more than most, despite the cost. Ensures function, reliability, and pushes it all into known factor space. We don’t like surprises in critical situations.

          Given, my sample size is singular, and being only one other in this part of the state afaik that I am cognizant of. On the other hand, prudence dictated a CHF barrelled example for this particular use case due to the conversion being intended from the onset. Highly recommend the same based on my results, with the addendum that results may vary.

        • Noted re barrel and will be silly having to store it in VT/PA but cant just go with a regular unthreaded barrel like a 45 super on the heavier H&K options. May end up being a escape from NY purchase after retirement. The round count is both impressive as well as encouraging and I am glad I am already familiar with loading for 45 super as it is just a change in brass and seating depth (and new load data).

        • Is a serious consideration, and may be worth the wait. Keeping firmly in mind this is almost exclusively FNX experience, Glock not withstanding. Put a fair amount of thought into this, gonna dump a good deal of knowledge on you. So buckle up buttercup.

          The other gentleman I know has the ported style on his 1911, which is where I draw my mag-na-port style thoughts from. Does not slow the slide enough in my opinion with the upper middle range of Rowland pressures. This of course differs from the method you’re considering with the extended barrel, albeit I have no expertise with this method, and therefore cannot rightfully reply with a valid thought outside of a questioning “should work”. Would expect it to be less effective, with the shorter length overall of the port being restricted to the wall thickness of the barrel. Maintaining pressure over increased distances is typically advantageous.

          S.W.A.G. admittedly, Scientific Wild Ass Guess. Need a FEA program to expedite a model analysis of this vs. that, without doing a few days on the math the hard way.

          Easy peasy from reloading Super for sure, Grafs is your most consistent option for Rowland brass. Starline is outstanding and relatively inexpensive, all niche related factors considered.

          Would in the past recommend SMC as a training alternate, but finding brass is nearly miraculous in the modern day. We don’t even want to talk .451 Detonics brass modification, they’re 3.8x the cost of even Rowland right now. Never thought I’d see the day where Rowland brass was a cheap option, but there it is. Defies the purpose of reloading when you can buy DoubleTap SMC for less per than loading yourself.

          $1.74 ea. on the lowest price options

          $1.47 per casing

          Rowland $0.39 per

          Good start for your load data workups:

    • If barrel length is your primary concern get the first x-ten with its 5” bull barrel and 15round capacity better than a 1911 and just shoots lights out I know I own one

    • No need to hold out. You can get a 5 or 6 incher for less than this little carry gun. And you will definitely be rewarded with velocity.

      But I like the idea of having more compact carry options. The G29 just doesn’t feel right to me for carry.

  2. Hmm, P320 @ 32 oz + 15 rd mag vs P220 @ 44 oz + 8 rd mag vs S&W M&P M2.0 10MM @ 32 oz + 15 rd mag.
    The Smith is cheaper, the difficult part is living behind the iron curtain. Have to go out of state and have it shipped to a Maryland FFL and keep the 15 rd mags in pocket.

  3. BBTI has a handy chart of muzzle velocity vs. barrel length for a variety of loads, complete with a handy pop-up muzzle energy graph. They all have a pretty steep slope in barrels shorter than that of a 6 inch “Hunter” gun.

    Whatever the barrel length, Buffalo Bore’s hard cast load is significantly hotter than the rest, and Federal’s Hydra-Shok is more to the milquetoast (.40SW) end of the scale.

  4. I like my G40 but this does look pretty nice. As always buy the good 10mm ammo like SIG, Underwood, Steinel, Double Tap, Buffalo Bore etc and avoid the underpowered laughable stuff. Hardcast for bear

  5. Heavy, but I’ll stick with my Tanfoglio Witness Hunter! Tanfoglio version of CZ-75 action in 10 mm with a no compromise 6” barrel! No longer available new, gee I wish I’d bought two. Not just relatively powerful, but with a double stack magazine and the most accurate handgun in my collection save the S&W 41s!

  6. I do not hunt with a pistol, its revolvers for me.
    Pistols do jam, without bread that’s no good.
    10mm cant do nothing a .44mag wont do better.
    And who needs extra bullets when 3 is about all your going to get off before the Sasquatch either runs off or dies.

    • Test that theory. Have a timer and set a par time of 2 seconds, 3 seconds, or whatever you like. Then, set up a target, IDPA/IPSC/Pie Plate, at 20-30 feet. See if a 44 Mag revolver or a 10mm auto gets the most shots and hits off in that time. Wash, rinse, and repeat 3-4 times to validate.

      • That’s where I’m at. I love 44 and 357 revolvers, but I can put a lot more hard cast lead in the kill zone in those precious seconds with my G40.

    • Another consideration …

      I’ve never had a failure with my modern pistols and carry ammo. I’ve never had a failure with my revolvers either.

      But from a mechanical standpoint, when a revolver does fail, it often needs a trip to the gunsmith. When a pistol fails, it usually just needs a rack of the slide or a quick mag swap.

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