About this product
The Sig P320 XTEN Comp is a compensated, striker-fired 10mm Auto pistol built on Sig's P320 X-Series frame, combining the modularity of the P320 platform with a ported slide designed to tame 10mm's stouter recoil. It's aimed at shooters who want 10mm's power - heavier bullets, higher velocity than 9mm or .40 - in a package built for fast, accurate follow-up shots rather than a traditional woods-carry 10mm. Sig markets the XTEN Comp for competition, range use, and hard-charging duty or defensive roles, and it's built to be shot a lot rather than carried and forgotten.
What is the Sig P320 XTEN Comp?
It's a modular, striker-fired handgun on Sig's X-Series P320 frame, chambered in 10mm Auto instead of the more common 9mm or .40 S&W X-Series builds. The "Comp" designation refers to the integrated compensator machined into the slide and barrel, which vents gas upward to counteract muzzle rise. Like other X-Series guns, the grip module, trigger, and fire-control unit follow Sig's modular parts system, so components can be swapped between compatible P320 frames. The slide typically ships taller than a standard P320 slide to accommodate the porting and any mounted optic, which changes holster fit versus a non-Comp P320.
What is it used for?
Competitive shooters use compensated 10mm builds like this for major-power-factor divisions where the extra recoil impulse of 10mm needs to be managed for fast splits, and hunters or backcountry carriers like 10mm for its energy against larger animals. It's less common as a pure concealed-carry gun given its size and the compensator's bulk, and more of a range, competition, or duty-style pistol.
How does it compare to a standard 9mm P320?
Same basic trigger feel and modular parts philosophy as any X-Series P320, but 10mm brings meaningfully more recoil and muzzle blast than 9mm even with the compensator working. Ammunition costs more and is less common on shelves than 9mm. If you want the X-Series ergonomics without the recoil management project, a 9mm X-Series model is the easier day-to-day gun to run.
What fits it?
It's optics-ready on Sig's standard X-Series cut, so most direct-mount red dots compatible with other optics-ready P320 models will fit, and it uses Sig's P320 X-Series holster footprint for most aftermarket Kydex makers. Magazines follow the 10mm P320 pattern rather than 9mm P320 magazines, so double-check caliber before ordering spares, and confirm your existing P320 holster is rated for the taller Comp slide before assuming it will drop in without a fit check.
Does it work in California?
Check roster status before ordering - Sig's P320 line has a mixed history on California's handgun roster, and newer variants like the XTEN Comp are not guaranteed to be listed. If it isn't on the roster, delivery in-state is generally limited to exempted categories such as private-party transfer of an already-registered gun or sworn law enforcement. See our California gun laws page and ask our transfer desk to confirm current roster status before you commit.
Is it worth it?
If you shoot major-power-factor competition or specifically want a compensated 10mm for hard-hitting defensive use, this fills a narrow niche well. If you just want a capable, easy-shooting X-Series pistol, a 9mm model will save you money on ammunition and be easier to run for most shooters. Compare it against the Sig MPX Copperhead K if you're deciding between a 10mm handgun and a 9mm pistol-caliber platform instead.
FFL transfer required
This item is a firearm and ships only to a licensed FFL dealer, never to a home address. At checkout, enter your preferred dealer as the shipping address, or leave it blank and we will assign a licensed dealer near you at no extra cost. You complete the background check and paperwork with the dealer when you pick up.
California buyers: handguns must be on the California roster for delivery to a California FFL, a Firearm Safety Certificate (FSC) and DROS are handled at the dealer, and the 10-day waiting period applies. Out-of-state buyers receive the firearm through their own local FFL under their state's rules.
Specs at a glance
Pros & cons
What works
- 10mm power in a modular, optics-ready X-Series frame
- Integrated compensator helps manage 10mm muzzle rise
- Shares X-Series ergonomics and holster footprint with other P320 models
- Good fit for major-power-factor competition
Trade-offs
- 10mm ammunition costs more and is less common than 9mm
- Compensator adds bulk versus a standard-slide P320
- Not guaranteed California roster-legal - confirm before ordering
- Not an ideal first handgun given recoil and cost
Key attributes
| Transfer | Ships to your FFL dealer |
| Caliber | 10mm Auto |
| Frame | Sig X-Series (modular) |
| Slide | Integrated compensator, optics-ready |
| Manufacturer | Sig Sauer |
| Model | P320 XTEN Comp |
Frequently asked questions
- What caliber is the XTEN Comp?
- 10mm Auto - a higher-pressure, harder-hitting round than 9mm or .40 S&W, built on Sig's X-Series P320 frame.
- Does it come optics-ready?
- Yes, X-Series Comp models ship cut for direct-mount red dot optics using Sig's standard X-Series footprint.
- Will my 9mm P320 magazines work?
- No - 10mm P320 models use 10mm-specific magazines, not the 9mm P320 pattern.
- Is this a good first 10mm?
- It's a capable one, but the compensator and 10mm recoil impulse together are more gun than most first-time shooters need; a 9mm X-Series model is the easier starting point.
- Can California buyers get this one?
- Only if it's currently listed on the California handgun roster or the sale qualifies for an exemption - confirm with our transfer desk before ordering.