The SIG Sauer P320-XFULL is a full-size, optics-ready service pistol built for duty, competition, and high-round-count training. It delivers SIG’s proven modularity in a package optimized for speed and control. This model has been on our shelves since early 2026, and its low return rate tells us customers get exactly what they expect from it.
Stand-Out Features
- Optics-Ready Platform: The slide is cut from the factory to accept SIG’s ROMEO1PRO and other popular micro red dots without an adapter plate.
- Enhanced Grip Module: Features an X-Series grip with more aggressive texturing, an undercut trigger guard, and a high-beavertail for a higher, more controllable hand position.
- Flat X-Series Trigger: Provides a consistent, crisp break and a short, tactile reset for improved shot-to-shot speed.
- Full-Size Sight Radius: Comes with high-visibility X-RAY3 Day/Night sights for rapid target acquisition, co-witnessing with an optic.
- Reliable Performance: In our staff testing, this pistol feeds reliably with both brass and steel case ammunition.
Technical Data
| Caliber | 9mm |
| Action | Striker-Fired |
| Barrel Length | 4.7″ |
| Overall Length | 8.0″ |
| Height | 5.6″ |
| Weight (measured) | 1.3 oz |
| Magazine Capacity | 17+1 Rounds |
| Frame / Slide | Polymer / Stainless Steel |
Your Questions Answered
Is this the same as the M17/M18?
No. The P320-XFULL is a commercial, optics-ready variant with the X-Series grip module and flat trigger. The M17/M18 are military-spec models with manual safeties and different grip modules.
What optics fit the slide cut?
The slide is cut for the SIG Sauer ROMEO1PRO footprint. It will also directly accept the Leupold DeltaPoint Pro. Adapter plates are available from SIG and other manufacturers for optics like the Trijicon RMR or Holosun 507C.
Does it come with a manual safety?
This specific SKU is configured without a manual safety, which is the most common configuration for this model. The FCU (Fire Control Unit) is the modular heart of the P320 system and can be placed into different grip modules, including those cut for a safety.
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