Sig Sauer P320 XTEN 10mm 5″ Optic-Ready, XRAY3, 2x15rd
Video review
Expert review
About this product
What is the Sig Sauer P320 XTEN 10mm 5″ Optic-Ready pistol? It’s a full-size, striker-fired semi-automatic handgun purpose-built by Sig Sauer to deliver the ballistic authority of the 10mm Auto cartridge through a modern, modular, and optics-ready duty platform optimized for controllable, sighted fire. Designed around the proven P320 fire control unit and the XSeries grip module, it combines a 5-inch bull barrel for velocity with a weight of 33 ounces and an 8.5-inch overall length for stabilizing recoil in a duty-size frame that accepts common red-dot optics via its factory-cut slide.
What is the Sig Sauer P320 XTEN used for?
The P320 XTEN is used for defensive and field applications where a higher-energy cartridge than 9mm is warranted, yet modern ergonomics and optics compatibility are non-negotiable. Its 5-inch barrel extracts maximum performance from the 10mm Auto cartridge, making it suitable for backcountry defense against large fauna, while the optic-ready system and 15-round magazine capacity make it a viable duty option for officers in rural or wilderness jurisdictions. The XRAY3 day/night sights provide an immediate backup aiming solution, a critical feature for a firearm carried in variable light conditions.
How does the Sig Sauer P320 XTEN compare to the Glock 40 MOS?
The P320 XTEN offers superior modularity and ergonomics compared to the Glock 40 MOS, though the Glock may have a slight edge in aftermarket holster compatibility. The XTEN's fire control unit is serialized, allowing legal swaps between frames of different sizes and textures with a simple punch, a feature the monolithic Glock frame cannot match. The XTEN is 0.3 inches shorter in overall length than the Glock 40's 8.9 inches, and its XSeries grip angle and texture provide a more secure purchase under recoil, a crucial advantage for fast follow-up shots with the stout 10mm cartridge. For shooters who value a customizable grip and modern controls, the XTEN is the better platform; for those prioritizing ubiquitous holster and accessory support, the Glock retains its advantage.
What does it weigh and what are the dimensions?
The P320 XTEN weighs 33 ounces unloaded, measures 8.5 inches in overall length, and has a barrel length of 5 inches. The height with a magazine inserted is 5.8 inches, and the width across the slide is 1.4 inches. The pistol balances at a point about 1 inch forward of the trigger guard, a product of the 5-inch bull barrel, which aids in muzzle stability during rapid fire but adds noticeable heft compared to compact 10mm models like the Glock 29.
Who is this NOT for?
This pistol is not for a shooter seeking a concealed carry piece or a first-time 10mm owner on a tight budget. Its 33-ounce weight and 8.5-inch length make it impractical for IWB carry, better suited for a chest or duty holster. Furthermore, the cost of both the pistol and quality 10mm ammunition—often $0.60-$1.00 per round—makes it a significant investment; a dedicated shooter might spend $200 on 200 rounds in a single range session, a budget that could buy our Stevens 334 in .243 Win — our editorial take and a box of ammunition. It’s a specialist’s tool, not a general-purpose plinker.
What's in the box?
The pistol ships with two 15-round steel magazines, XRAY3 day/night sights pre-installed, a polymer grip module, and the optic-ready slide. Notably, it does not include an optic plate; the slide is cut to accept either the Sig Sauer ROMEO2 or the Trijicon RMR/SRO footprint directly, requiring a separate mounting plate for other popular optics like the Holosun 507C. You also receive a standard cable lock, a chamber flag, and the operator’s manual—a complete system ready for an optic and approximately 300 rounds of break-in ammunition.
Is the Sig Sauer P320 XTEN worth it at $846.99?
At $846.99, the P320 XTEN is worth it for the specialized shooter who needs a modern, modular 10mm duty pistol with native optics capability and has the budget for the ammunition. You’re paying for Sig Sauer’s duty-proven fire control system, the XSeries ergonomic improvements, and the factory optic cut—features that would cost over $200 to add aftermarket to a base model. For the money, you get a turn-key system that outperforms a basic hunting revolver in capacity and follow-up speed and offers more configuration options than a competing polymer-frame 10mm. However, if your use case is recreational target shooting with a magnum cartridge, the Stevens 555 Sporting O/U in 12 gauge offers a completely different, and perhaps more economical, experience.
Specs at a glance
Pros & cons
What works
- Weighs 33 oz — provides a stable platform for controlling 10mm recoil.
- 5-inch bull barrel — maximizes 10mm velocity and extends sight radius for accuracy.
- Optic-ready for RMR footprint — accepts most common micro red dots without custom machining.
- Includes two 15-round steel magazines — sufficient capacity for most defensive scenarios.
- Modular fire control unit — allows legal grip frame swaps for under $50.
Trade-offs
- No included optic plate for Holosun/Vortex — adds $40-$70 to total cost for most popular optics.
- Requires specialized holsters — incompatible with standard P320 holsters, limiting off-the-shelf options.
- 33 oz unloaded weight — over 10 oz heavier than a compact 10mm, making it unsuitable for concealed carry.
- High ammunition cost — practice ammo averages $0.80/round, making proficiency expensive.
Key attributes
| upc | 798681652341 |
| manufacturer | SIG SAUER |
| manufacturer part number | 320X5-10-BXR3-R2 |
| action | Striker Fired |
| atf type | Pistol |
| barrel finish | Black |
| barrel length | 5" |
| caliber/gauge | 10mm |
| capacity | 15 + 1 |
| color | Black |
| length | 13.5 |
| magazine included | 2 x 15-Round |
| model | P320 |
| number of magazines | 2 15 rd. Steel Mags |
| package height | 3.0 |
| package width | 10.0 |
| product type | Semi-Auto Pistol |
| safety | No |
| shipping weight | 3.85 |
| sights | Front: XRay3 | Rear: R2 |
| sights type | Night Sights |
| slide description | Optic Ready/Serrated |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
| state restriction (or) | NO SALE TO OREGON |
| state restriction (ri) | NO DIRECT SHIP TO RHODE ISLAND |
| state restriction (wa) | NO DIRECT SHIP TO WASHINGTON |
Frequently asked questions
- Does the optic-ready slide come with mounting plates?
- No, the slide does not ship with universal mounting plates; it is cut to directly accept a Sig Sauer ROMEO2 or a Trijicon RMR/SRO footprint optic. For other common optics like the Holosun 507C or the Vortex Viper, you must purchase a specific mounting plate from Sig Sauer or a third-party manufacturer like CHPWS, which typically costs between $40 and $70.
- Does it fit in a standard P320 holster?
- No, due to the 5-inch bull barrel and full-size XSeries frame dimensions, it will not fit holsters molded for the standard P320 Full Size or Carry models. You will need a holster specifically designed for the P320 XTEN or XTEN-compensated models; reliable brands like Safariland (model 6390RDS) and Tier 1 Concealed offer options, but lead times can be 4-6 weeks for custom orders.
- Can I use 9mm conversion parts with this 10mm model?
- No, the P320 XTEN’s fire control unit, slide, barrel, and magazines are dimensionally specific to the 10mm Auto cartridge. The slide and frame are longer than standard P320 components, and the magazine well is wider to accommodate the larger 10mm casing. Attempting to install a 9mm conversion kit will result in functional failures and potential safety hazards.
- How long does shipping to an FFL take?
- For in-stock items, Ironclad Armory processes orders within 1 business day. Shipping via our contract carrier typically takes 3-5 business days to reach your selected FFL dealer. The total time from order to pickup is generally 5-8 business days, depending on your FFL’s processing speed for background checks and transfers.
- Are the XRAY3 sights tritium or fiber optic?
- The XRAY3 sights use tritium vials for low-light illumination, combined with a bright white ring for daylight contrast. The front sight houses a green tritium vial, and the rear sight houses two yellow tritium vials, providing a definitive three-dot sight picture. The tritium has a half-life of approximately 12 years, after which brightness will diminish.