Description
The SIG SAUER P320 X-FULL 9mm 4.70″ XSeries Striker-Fired Pistol is the full-size duty and competition-ready handgun that bridges the gap between a service pistol and a precision range tool. It ships optic-ready with the Romeo1PRO footprint, includes XRay3 day/night sights, and accepts a removable magwell and grip weight for custom balance. Two 10-round steel magazines get you on the range immediately.
| Manufacturer | SIG SAUER |
|---|---|
| Model | P320 X-FULL (P320XF) |
| Caliber | 9mm |
| Barrel Length | 4.70″ |
| Overall Length | 8.2″ |
| Height | 5.8″ |
| Width | 1.3″ |
| Weight (unloaded) | 30.5 oz (per manufacturer specs) |
| Finish | Nitron |
| Capacity | 10 rounds |
| Sights | XRay3 day/night sights |
| Optic Ready | Yes – Romeo1PRO footprint |
| Condition | New |
Key Features
- XSeries Grip Module – Extended beavertail and deep undercut let you lock in a high grip without getting bit. Per SIG SAUER, this reduces muzzle flip by up to 15% compared to the standard P320 grip.
- Optic-Ready Slide – Ships with a rear sight plate that works with the Romeo1PRO footprint. No milling required; you’re ready for a red dot in minutes.
- XRay3 Day/Night Sights – Tritium front with bright white rings and a contrasting rear give you a fast sight picture in any light. No batteries, no switches.
- Removable Magwell & Grip Weight – Add or remove the magwell for easier reloads, and drop in the grip weight for a more planted feel. It’s your choice how the gun balances.
- Two 10-Round Steel Magazines – Reliable SIG factory mags with a steel body and anti-tilt follower. You get two right in the box, so you can load and shoot immediately.
Who It’s For
This pistol is built for the EDC enthusiast who wants a full-size platform that pulls double duty. If you carry appendix or strong-side with a full-frame gun, the X-FULL gives you the sight radius and capacity of a service pistol with the grip feel of a custom shop piece. Competition shooters and USPSA/IDPA guys will appreciate the optic-ready slide and magwell compatibility for faster reloads. It’s also a solid choice for home defense—the 4.70″ barrel keeps velocities up, and the XRay3 sights work with or without a WML.
Pros & Cons
- Pro: Optic-ready with a proven footprint (Romeo1PRO). No adapter plates needed.
- Pro: Modular grip system—swap modules, add weight, or change the magwell without a gunsmith.
- Pro: 30.5 oz unloaded weight tames recoil without being a boat anchor.
- Con: The trigger is good but not competition-grade out of the box. Expect a 5-6 lb pull with a bit of take-up. Some shooters will swap in an aftermarket trigger kit (like the Gray Guns or Apex) for a crisper break.
Comparison vs. Competitors
| Feature | SIG P320 X-FULL | Zev OZ9 Full-Size | Agency Arms Glock 17 |
|---|---|---|---|
| Caliber | 9mm | 9mm | 9mm |
| Barrel Length | 4.70″ | 4.49″ | 4.49″ |
| Optic Ready | Yes (Romeo1PRO) | Yes (RMR/Holosun) | Yes (RMR) |
| Grip Modularity | Full (swap modules, magwell, weight) | Partial (grip frame only) | None (fixed frame) |
| Weight Unloaded | 30.5 oz | 26.5 oz | 24.5 oz |
| MSRP | $1049.99 | $1,899.00 | $1,595.00 |
The SIG P320 X-FULL beats both competitors on price and modularity. The Zev OZ9 has a better trigger out of the box but costs nearly double. The Agency Arms Glock 17 is a solid choice but lacks the grip customization and comes with a higher price tag. For the EDC crowd, the SIG gives you the most flexibility for the money.
FAQ
Is the SIG P320 X-FULL compatible with standard P320 holsters?
Yes, but only if the holster is designed for the full-size P320 with a 4.7″ barrel. The XSeries grip module has a slightly different shape at the trigger guard and beavertail, so some holsters may need minor fitting. We recommend holsters from Tier 1 Concealed, Safariland, or Trex Arms that list the X-FULL specifically.
Can I use P320 compact magazines in the X-FULL?
Yes, but they will sit flush with the grip and you’ll lose capacity. The X-FULL uses full-size 17-round magazines; the included 10-rounders are for restricted states. Compact 15-round mags work but won’t fill the grip well.
What red dots fit the factory optic cut?
The slide is cut for the SIG Romeo1PRO footprint. That includes the Romeo1PRO, Romeo2, and some third-party optics like the Leupold DeltaPoint Pro with an adapter plate. Check our optic mounting guide for compatibility.
Does this pistol come with a manual safety?
No. The X-FULL does not ship with a manual safety. If you need one, you’ll have to add an aftermarket safety kit or choose a different P320 variant.
Why Buy From Us
- ✅ Nationwide delivery to all 50 states
- ✅ Ships within 1-2 business days
- ✅ 30-day return policy on unfired firearms
- ✅ Secure checkout with encryption
Last updated: April 2026
Over 85% of our customers are repeat buyers. That’s a stat we’re proud of because it means we get it right the first time.
Check out more Semi Auto Handguns or browse our Firearms and EDC Gear categories.
Reviews
There are no reviews yet.