Description
The P320 X-Full sits in a sweet spot in the Sig X-series lineup. It gives you a genuinely full-size pistol with the kind of ergonomic upgrades the standard P320 Nitron doesn't have, without pushing you all the way up into competition-specific territory. The 4.7-inch slide and barrel deliver a 6.6-inch sight radius, which translates to a noticeably cleaner sight picture and more consistent groups at distance compared to shorter barrel configurations. At 29.6 oz loaded, it has enough weight to soak up recoil without feeling cumbersome on a range bag or duty belt.
P320 X-Full X Grip Module and Trigger
What really sets this apart from the base P320 is the X Grip module. It's built with a deep trigger guard undercut and an extended beavertail that lets you get a higher, more locked-in grip. Higher grip means more control over muzzle rise, which means faster, more accurate follow-up shots. The improved magwell also makes reloads smoother without the bulk of a competition funnel. Pair that with the straight X Flat Trigger and you get a cleaner break and a more consistent pull than the standard curved trigger. This version also ships with a manual safety and magazine disconnect, which is standard on this model.
Optic-Ready Slide and XRay3 Sights
The slide comes from the factory with a PRO optic footprint cut, which is the current-generation cut that works natively with optics like the Sig Romeo X Pro, Leupold DeltaPoint Pro, and Trijicon RMR-footprint optics using an adapter plate. The XRay3 day/night sights are tritium-powered for low-light use and feature a high-visibility front post that makes target acquisition fast in any lighting. If you never mount a red dot, these sights stand on their own just fine. If you do add a dot, the mechanical loaded chamber indicator on this model gives you a tactile and visual chamber check without any guesswork.
The slide and FCU are stainless steel with a Nitron finish, the barrel is carbon steel, and the frame is polymer. It's a proven combination that keeps the weight manageable while holding up to hard use. The M1913 accessory rail on the frame means you can run a light or laser without adapters. This is a pistol that works well for range training, home defense, and duty use, and the modular P320 platform means the fire control unit can be swapped into different grip modules and slide configurations down the road if your needs change.
Key Specifications
- Manufacturer: Sig Sauer
- Model: P320 X-Full
- MPN: 320XF-9-BXR3P-MS-CA
- UPC: 798681699247
- Caliber: 9mm Luger
- Action: Striker-Fired
- Barrel Length: 4.7 in (119.38 mm)
- Overall Length: 8.2 in
- Overall Width: 1.3 in
- Height: 5.5 in
- Sight Radius: 6.6 in
- Weight: 29.6 oz (with magazine)
- Capacity: 10+1
- Sights: XRay3 Day/Night Sights
- Optic Cut: PRO Footprint (DeltaPoint Pro compatible)
- Grip Module: X Full-Size Small (X Grip, Polymer, Black)
- Trigger: X Flat Trigger, Striker-Fired
- Manual Safety: Yes
- Slide Finish: Nitron
- Slide Material: Stainless Steel
- Barrel Material: Carbon Steel
- Accessory Rail: M1913 Picatinny
What’s Included
- Sig Sauer P320 X-Full 9mm Pistol
- 2 x 10-Round Steel Magazines
- Optic Plate Cover
Frequently Asked Questions
What optics are compatible with the P320 X-Full slide?
The P320 X-Full uses the PRO optic footprint cut, which natively fits optics with a DeltaPoint Pro footprint like the Leupold DeltaPoint Pro and Sig's own Romeo X Pro. Optics using a Trijicon RMR footprint can also be mounted using an adapter plate. This is the current-generation cut and is a significant improvement over older RX-cut P320 slides in terms of optic compatibility.
Do the factory XRay3 sights co-witness with a red dot?
The standard XRay3 sights that ship on the P320 X-Full are not suppressor height, so they will not co-witness with most pistol red dots. If co-witnessing is important to you, you would need to swap to taller suppressor-height iron sights after mounting your optic. That said, many people run the irons as backup sights without co-witnessing and find it works just fine in practice.
What makes the P320 X-Full different from the standard P320?
The X-Full includes the X-series grip module upgrade, which adds a deeper trigger guard undercut, an extended beavertail, and an improved magwell compared to the standard polymer grip frame. You also get the straight X Flat Trigger instead of the standard curved trigger, and XRay3 tritium night sights in place of the basic steel sights. The optic-ready PRO footprint slide is also part of the X-series package.
Does the P320 X-Full have a manual safety?
Yes, this specific model (MPN 320XF-9-BXR3P-MS-CA) includes a manual safety. It also features a magazine disconnect safety. The standard non-CA P320 XFull does not include a manual safety, so this is a notable difference if you are comparing models.
What holsters fit the Sig P320 X-Full?
The P320 X-Full uses a full-size frame, so holsters made for the standard P320 full-size generally fit. Many major holster manufacturers including Safariland, Blackhawk, and Blade-Tech offer options for this platform. If you plan to run a mounted red dot, make sure your holster is specifically listed as optic-compatible for whatever optic you choose.
Can I swap the grip module or convert the P320 X-Full to a different configuration?
Yes, the P320 platform is built around a serialized fire control unit (FCU), which is the actual firearm. That FCU can be installed in different grip modules, paired with different slides, and even configured in different calibers with the right conversion parts. It is one of the most modular pistol platforms on the market, and a big reason why the P320 has such a wide following.




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