Description
The SIG SAUER P320-XFIVE LEGION is a competition-ready, optics-capable pistol built for the serious shooter. It combines the proven P320 modularity with Legion-specific performance features for faster splits and improved recoil management. Since arriving on our shelves in late 2025, this model has shown a consistently low return rate, with customers reporting it meets their high expectations for a duty-to-competition firearm.
Why This One?
- Optics-Ready Platform: Comes with a removable rear sight plate, allowing for direct mounting of popular micro red dots without an adapter plate.
- Enhanced Grip & Balance: The TXG tungsten-infused polymer grip module adds significant weight low in the frame, dramatically reducing muzzle flip and improving shot-to-shot recovery.
- Competition-Optimized Slide: Features front and rear slide serrations, a flat-faced Legion trigger, and a lightened slide with a unique Legion finish for smoother cycling.
- Extended Capacity & Sights: Ships with two 17-round magazines and high-visibility X-RAY3 day/night sights for a fast, clear sight picture.
- Proven Reliability: Built on the battle-proven P320 FCU (Fire Control Unit), ensuring the core mechanics are rugged and dependable under pressure.
Full Spec Sheet
| Model | P320-XFIVE LEGION |
| Caliber | 9mm |
| Barrel Length | 5.0 in |
| Overall Length | 8.5 in |
| Height | 5.6 in |
| Weight (measured) | 8.0 oz (slide/barrel assembly) |
| Frame Material | Tungsten-Infused Polymer (TXG) |
| Optic System | SIG Sauer ROMEO1PRO / DPP footprint |
Q & A
Is the slide already cut for an optic?
Yes. The slide comes from SIG with a removable rear sight plate. Removing this plate reveals the integrated mounting system for optics using the ROMEO1PRO or DeltaPoint Pro footprint. No adapter plate is required for those specific optics.
How does the TXG grip module feel?
The Tungsten-Infused Polymer (TXG) module is denser and heavier than standard polymer grips. This weight is concentrated in the grip, pulling the pistol’s balance point downward and into the hand. The result is a very solid, stable feel that significantly mitigates muzzle rise. The texture is aggressive for positive control without being abrasive.
Will this slide fit on my standard P320 frame?
This X-Series slide is designed to work with X-Series grip modules. It will physically fit on a standard (non-X) P320 full-size frame, but there will be a slight gap at the front of the dust cover. For optimal fit and performance, we recommend using it with an X-Series or TXG grip module. Our staff notes a slightly tighter fit on some Gen4-style frames compared to Gen5, but this does not affect function.
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