SIG Sauer P320 XTEN 10mm 5in Optic-Ready 10rd
About this product
The SIG Sauer P320 XTEN 10mm 5in Optic-Ready 10rd is a full-size, modular striker-fired pistol engineered to handle the specific pressure and recoil characteristics of the 10mm Auto cartridge. It represents SIG’s mature X-Series framework applied to a legitimate power caliber, avoiding the compromises seen in many previous platform conversions. This pistol arrives optic-ready with a robust bull barrel and is built for shooters who need a durable, precise handgun for demanding applications like backcountry defense or hunting.
What is the SIG Sauer P320 XTEN used for?
The P320 XTEN 10mm is engineered for backcountry defense against large predators and for hunting medium-sized game at close ranges. Its 5-inch, carbon-steel bull barrel stabilizes heavy 10mm loads, providing superior ballistic performance over 9mm and .40 S&W while its 33-ounce weight manages recoil. This makes it a sound choice for hunters as a primary or backup firearm, or for shooters who want a high-capacity, optic-ready platform for training with a strenuous cartridge.
How does the SIG Sauer P320 XTEN compare to the Glock 40 MOS?
The P320 XTEN offers a superior modular grip system and a crisper, more tunable X-Series flat trigger compared to the Glock 40 MOS’s fixed grip and standard striker trigger. The XTEN's grip angle and texture provide more positive purchase for managing the 10mm's recoil, though it is slightly heavier than the 29.9-ounce Glock. For a pure hunting pistol, the Glock has a longer track record and vast holster compatibility, but for a shooter wanting a more ergonomic and modern optic-ready platform, the XTEN is the more sophisticated choice.
What does it weigh and what are the dimensions?
Unloaded, the P320 XTEN weighs 33 ounces (936 grams) and measures 8.5 inches in overall length with a 5-inch bull barrel. Its height is 5.5 inches, largely dictated by the 10-round magazine, and it has a slide width of 1.4 inches. These dimensions are critical for holster selection and pack carry, and the weight contributes directly to shooting comfort with hot 10mm loads, which can generate over 600 ft-lbs of energy.
Who is this NOT for?
This pistol is not for concealed carry, urban self-defense, or budget-conscious new shooters. Its 8.5-inch length and 33-ounce weight make it impractical for daily concealed carry compared to a compact rifle, and the cost of 10mm ammunition (often $0.60-$1.00 per round) makes high-volume practice prohibitive. If your primary need is a low-recoil, high-capacity home defense pistol, a carbine or a 9mm variant of the P320 is a more economical and practical solution.
What's in the box?
You receive the complete pistol, two steel 10-round magazines, the optic cover plate for the SHIELD/RMSc footprint, SIG's XRAY3 day/night sights pre-installed, a standard bore brush, a basic pistol lock, and the manufacturer’s documentation. It ships with exactly 2 magazines, which is standard but limiting for a duty-oriented firearm; immediately budget for acquiring additional magazines which retail for approximately $45 each.
Is the SIG Sauer P320 XTEN worth it at $846.99?
At $846.99, the XTEN is a premium-priced but justifiable tool for its specific niche of field-ready 10mm performance. You are paying for SIG's refined trigger, modular grip system, and robust optic-mounting solution, which are genuine improvements over less expensive 10mm platforms. If your use-case specifically demands a reliable, high-capacity 10mm pistol capable of mounting a micro red dot with minimal gunsmithing, this is a direct and effective solution that works out of the box.
Specs at a glance
Video review
Pros & cons
What works
- SHIELD/RMSc optic cut included – no $150-200 milling required
- XRAY3 night sights pre-installed – tritium vials glow for 12+ years
- 33 oz weight – 10% heavier than Glock G40 for better recoil management with 10mm
- Modular polymer grip – can be swapped in minutes for $40-70 without an FFL
Trade-offs
- Limited 10-round magazines – 15-rounders exist but are expensive and may not be state-compliant
- SHIELD/RMSc footprint only – requires an adapter plate for popular optics like Holosun 507C
- Proprietary optics plate included is plastic – a $65-100 aluminum replacement is recommended for hard use
- Flared magazine well not included – a $75 aftermarket add-on for faster reloads
Expert review
Key attributes
| upc | 798681697694 |
| manufacturer | SIG SAUER |
| manufacturer part number | 320X5-10-BXR3-R2-10 |
| action | Striker Fired |
| atf type | Pistol |
| barrel finish | Black |
| barrel length | 5" |
| caliber/gauge | 10mm |
| capacity | 10 + 1 |
| color | Black |
| length | 13.5000 |
| mount type | Sig Romeo2 Footprint |
| number of magazines | 2 10 rd. Steel Mags |
| package height | 3.0 |
| package width | 10.0 |
| product type | Semi-Auto Pistol |
| shipping weight | 3.7 |
| sights | Front: XRay3 | Rear: R2 |
| sights type | Night Sights |
| slide description | Optic Ready/Serrated |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
Frequently asked questions
- Is it compatible with a SIG Romeo1Pro optic?
- No, it is not directly compatible without an adapter plate. The slide is cut for the SHIELD/RMSc footprint, while the Romeo1Pro uses a proprietary SIG footprint. You will need a third-party adapter plate from CHPWS or Springer Precision, which adds approximately $50 and elevates the optic.
- Does it fit standard P320 holsters?
- No, it does not. The XTEN's 5-inch slide and full-size frame are dimensionally distinct from standard P320 full-size models. You must source holsters specifically designed for the P320 XTEN or the P320 5" models. Safariland and Black Point Tactical offer duty and OWB options.
- How long does shipping take after ordering?
- All firearms ship within 2 business days after FFL verification to your chosen dealer. Once shipped, standard transit time with our carrier is 3-5 business days. The total timeline from order to dealer notification is typically 5-7 business days, barring regulatory delays.
- Does this work with aftermarket P320 triggers?
- Yes, it accepts most aftermarket P320 FCUs and trigger components. The pistol uses the standard P320 Fire Control Unit (FCU). Upgrades from brands like Armory Craft and Grayguns will drop in, though you must verify 10mm-specific spring kits for heavy loads.