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The P320 X-Full rounds out SIG's XSeries lineup as the full-size entry, and it checks nearly every box people look for in a serious do-it-all pistol. You get a 4.7" carbon steel barrel paired with a Nitron-finished stainless steel slide, an optic-ready Pro-Cut that accepts the Romeo1PRO footprint without any adapters, and XRAY3 day/night sights already installed. The grip module is built with an extended beavertail and a deep undercut trigger guard so you can ride the gun high and get your hand as close to the bore axis as possible. That translates to less muzzle flip and faster follow-up shots, especially during strings of fire. It also accepts an optional removable magwell and grip weight if you want to tune the feel down the road. This SKU ships with two 10-round steel magazines.
The heart of the P320 is its serialized Fire Control Unit, the stainless steel chassis that houses the trigger, striker, and sear assembly. That FCU is the legal firearm. Everything else, the grip module, slide, and barrel, is effectively a component you can swap without tools or a gunsmith. That means the P320 X-Full isn't just a pistol, it's a platform. If your needs change, you can reconfigure the size, swap to a different grip module, or drop the FCU into a competition setup without buying a new gun. It's a genuinely practical feature that keeps paying off over time.
The XSeries straight flat trigger is a notable upgrade over the standard P320 trigger. The flat face and 90-degree break geometry give you a more consistent trigger press, which most people notice right away in their shot-to-shot accuracy. The XRAY3 sights are purpose-built for fast acquisition across lighting conditions, with a tritium and fluorescent polymer front sight and tritium rear inserts. In daylight, the front sight pops. In low light, you have a usable picture without fumbling for a flashlight to find your sights. The optic-ready slide means you can mount a Romeo1PRO or compatible PRO RX footprint optic directly to the rear plate without removing the iron sights, so you keep your backup irons no matter what.
No, this model (320XF-9-BXR3-RXX-10) ships optic-ready but without a red dot installed. The Pro-Cut slide has a rear sight plate that is compatible with the Romeo1PRO and other PRO RX footprint optics, so adding one is straightforward with no adapter plates needed. The XRAY3 irons are included and remain usable with or without an optic.
The XSeries uses a flat-faced trigger designed for a cleaner, more consistent press with a 90-degree break geometry. Many people find it improves their shot-to-shot consistency compared to the standard curved P320 trigger because the flat face encourages a more repeatable finger placement. It's a meaningful upgrade, especially for anyone putting serious rounds downrange.
Yes. The XSeries grip module on this pistol is specifically designed to accept SIG's optional removable magwell and optional grip weight as add-on accessories. The magwell speeds up reloads, and the grip weight adds mass to reduce felt recoil and muzzle movement. Neither comes included in the box, but both drop in without modification.
The P320 uses a serialized Fire Control Unit, a stainless steel chassis that houses the trigger and striker mechanism, as the legal firearm rather than the frame. That means you can swap the grip module, slide length, and barrel without any transfers or gunsmithing. Essentially, you own the FCU and can build the gun around it in multiple configurations over time.
It works well for both. The 4.7" barrel gives you a full sight radius and a slightly longer sight radius than carry-size models, which helps at distance on the range. The XRAY3 sights hold up in low-light situations, and the optic-ready slide means you can add a red dot whenever you're ready without buying a new pistol. The extended beavertail and deep undercut also make it comfortable to run for longer sessions.
This model features the Romeo1PRO / PRO RX footprint optic cut on the rear sight plate. The SIG Romeo1PRO mounts directly, and other optics sharing that footprint are compatible as well. The rear sight plate is an independent assembly, so you're not milling the slide to add an optic.
| UPC | 798681691951 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 320XF9BXR3RXX10 |
| Action | |
| Barrel Finish | Black |
| Barrel Length | 4.7" |
| Caliber/Gauge | 9mm |
| Capacity | 10 + 1 |
| Color | Black |
| Model | |
| Mount Type | Sig Romeo1Pro Footprint |
| Product Type | Striker Fired |
| Sights | Night Sights |
| Slide Description | Optic Ready/Serrated |
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