Gun Review: Sig Sauer P-320

    Sig has certainly jumped forward of other companies in the polymer gun market. With it’s modular design the 320 can be configured to fit just about any shooter at a reasonable cost. When looking through the Sig Pro Shop you see one wall with a lot of different frames from compact to full size as well as assorted grip sizes. The price runs $59.00 for a bare frame. It’s worth noting that grips from the 250 will work with the 320.

    Related: SIG P320 Selected as new US Army Handgun.


    When the owner purchases a new component it’s very simple to remove the internal chassis and mount it in the new frame. The same goes for the slide and caliber. Choose your caliber, purchase the slide and barrel put it on your frame and you essentially have a new pistol. The cost varies but to change calibers the average cost will run approx. $350.00 which is still less expensive than purchasing a new pistol. One of the better aspects of the P320 is what ATF considers to be “the” gun. The internal chassis is the gun according to ATF. The chassis is the serialized part that goes on the 4473. Simply this means when an owner buys one gun with the chassis he or she is able to purchase any combination of parts without dealing with additional paperwork.

    This is your gun!

    This is your gun!

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    The Sig Academy provided us with full size P-320’s in 9mm which we carried for half the day as we went through various drills on the academy ranges.


    Caliber 9mm, .40 S&W
    Action Type Striker Fired DAO
    Trigger Pull DA 5.5 – 7.5 lbs
    Trigger Pull SA NA
    Overall Length 8.0 in / 203 mm
    Overall Height 5.5 in / 140 mm
    Overall Width 1.4 in / 35.5 mm
    Barrel Length 4.7 in / 119 mm
    Sight Radius 6.6 in / 168 mm
    Weight w/Mag 29.4 oz / 833 g
    Mag Capacity 9mm 17 Rounds, .40 S&W 14 Rounds
    Sights SIGLITE® Night Sights
    Grips Interchangeable Polymer
    Frame Finish Stainless Insert
    Slide Finish Nitron®
    Accessory Rail Yes
    Features Quick and safe take-down with no tools or trigger manipulation required, Double-Action striker fire operating system, SIGLITE® Night Sights. Comes with 2 magazines.
    MSRP $669.00-$713.00
    CA Compliant No
    MA Compliant No

    The P-320 is an easy pistol to carry all day weighing in at just less than 30 ounces. The pistol overall is very smooth with no sharp edges. I did find that the grips were a bit slick after some time on the range. The standard size grip felt very comfortable in my hand, but sweaty hands can be problematic however. After being on the range for a good while in the summer heat the grip is a little slippery. Of course there are many companies that specialize in stripling Glocks and M&Ps so there’s no reason why the same treatment wouldn’t work on the P-320.

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    As with all Sigs the shooters hand sits fairly low from the barrel centerline. I found the P-320 to have a higher grip and fits somewhere between a Glock and M&P in comparison. The grip angle is just about perfect and I found the 320 to be a natural pointer.

    As far as accuracy the P-320 excels. I was actually rather surprised since I’ve become rather used to polymer pistols capable of good combat accuracy but nothing you would want to use for precision shots. Not so with the Sig. This pistol is very accurate.


    The trigger pull is very good (5.5 pounds) and is far better than any other polymer striker fired pistol I’ve shot. Its only rival would be the M&P with the full APEX aftermarket trigger setup. Speaking of the trigger it doesn’t have the appearance of the usual polymer pistol trigger. The trigger has no center trigger safety. It’s a standard trigger smoothly finished. I understand from our conversations a Glock like trigger will be an option in the future.


    There’s really nothing about this Sig I would change with the exception of a more aggressive grip finish and a manual safety. I don’t consider the lack of a manual safety to be a deal breaker however.

    The P-320 is a polymer pistol worth checking out and one I enjoyed shooting a good deal. I can promise you should the search for a new military handgun goes forward you’ll see the Sig P-320 right in the competition.

    Phil White

    Retired police officer with 30 years of service. Firearms instructor and SRU team member. I still instruct with local agencies. My daily carry pistol is the tried and true 1911. I’m retired as associate editor since December 14th 2017. My replacement is my friend Pete M email: [email protected] you can reach Pete for product reviews etc.