Description
For most of its life the 10mm Auto cartridge lived in guns that were never really designed around it. They were .45 frames bored out, or all-steel classics that asked you to carry four pounds of pistol to get there. The Sig Sauer P320 XTen 10mm 15 Round takes the opposite approach. It is a purpose-built full-size 10mm on the P320 modular chassis, and it carries fifteen rounds of full-power ammunition without a grip that feels stretched to fit. For anyone who wants 10mm ballistics in a gun they can actually run hard, this is the configuration to start with.
Full Capacity, Not a Compromise
Fifteen rounds is the number that separates this pistol from most of the 10mm market. Traditional double-stack 10mm pistols land at eight to ten rounds, and the ones that go higher usually do it with a grip circumference that rules out smaller hands. The Sig Sauer P320 XTen 10mm 15 Round uses a dedicated 10mm and 45 Auto X-Series full-size grip module with aggressive stippling, sized so that the extra capacity does not cost you a usable firing grip.
The five-inch carbon steel barrel is the other half of the equation. Full-power 10mm loads were designed around a long barrel, and short-barreled 10mm pistols give up a meaningful chunk of velocity to muzzle flash. Five inches lets the cartridge do what it was built to do, and stretches the sight radius to 6.8 inches at the same time.
Sights, Optics and the Slide
The slide on the Sig Sauer P320 XTen 10mm 15 Round is an X-Series optic-ready unit in Nitron-finished stainless, with front and rear serrations that give you something to grab under recoil. The optic cut uses the PRO footprint, so a ROMEO2 mounts directly with no adapter plate stacking height onto the slide. An RMR-footprint sight will work with a sealing plate.
Irons are XRAY3 day and night sights: a bright front dot for daylight speed and tritium for low light. They sit high enough to co-witness with most enclosed-emitter optics, which matters more on a 10mm than it does on a 9mm, because if the dot goes down mid-string you want the irons already where your eye is looking.
| Caliber | 10mm Auto |
|---|---|
| Capacity | 15+1 rounds |
| Barrel Length | 5 in. carbon steel |
| Overall Length | 8.5 in. |
| Height | 5.6 in. |
| Width | 1.4 in. |
| Sight Radius | 6.8 in. |
| Weight | 33 oz. |
| Sights | XRAY3 day/night, tritium front |
| Optic Cut | PRO footprint, optic ready |
| Slide | Stainless, Nitron finish, front and rear serrations |
| Frame | 10mm/45 Auto X-Series full-size polymer grip module |
| Trigger | X-Series straight, 90-degree break |
| Safety | Ambidextrous manual thumb safety |
| Rail | M1913 Picatinny |
| UPC | 798681712854 |
Trigger and Controls
The trigger deserves its own note. The X-Series straight trigger breaks at ninety degrees rather than pivoting through an arc, which keeps your finger pressure pointed straight back instead of dragging the muzzle off target. On a cartridge that already wants to climb, a trigger that does not add its own sideways input is worth more than it sounds on paper. Pair that with the ambidextrous thumb safety fitted to this variant and the Sig Sauer P320 XTen 10mm 15 Round suits shooters coming from a 1911 background as readily as it does lifelong striker-gun shooters.

Why Shooters Pick This One
- Fifteen rounds of full-power 10mm in a grip most hands can actually manage
- Five-inch barrel that lets heavy 10mm loads reach their advertised velocity
- PRO-footprint optic cut takes a ROMEO2 with no adapter plate
- XRAY3 tritium irons that stay useful if the dot fails
- Ambidextrous manual safety for shooters who want one on a striker gun
- P320 modular fire control unit, so the grip module is a part you can swap
Who It Is For
This is the Sig Sauer P320 XTen 10mm 15 Round for the shooter who chose 10mm on purpose. Hunters backing up a rifle, hikers in bear country who want capacity alongside power, and competitors in divisions that reward major-caliber hits will all find the ballistics worth the recoil. It is a large pistol and it makes no pretence at being a discreet carry gun, but inside a chest rig or on a duty belt it does something a 9mm simply cannot.
Because the Sig Sauer P320 XTen 10mm 15 Round is built on the P320 fire control unit, the serialized part is the chassis rather than the grip module. That means the pistol you buy today can wear a different grip size later without a second transfer. If your state caps magazine capacity, the ten-round configuration of the same pistol is listed separately in our handgun catalog. Full factory specifications for the Sig Sauer P320 XTen 10mm 15 Round are published on the SIG Sauer product page.
Every Sig Sauer P320 XTen 10mm 15 Round sold by MAG5 Firearms ships new in the factory case with the accessories SIG includes, and transfers to your chosen FFL. The Sig Sauer P320 XTen 10mm 15 Round is a regulated firearm; we verify licensing before any order leaves the shop.









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