Description
The Sig Sauer P320 XCompact 9mm 3.6″ Optic-Ready X-Ray3 is a modular, striker-fired compact that splits the difference between a full-size duty gun and a subcompact for deep concealment. It ships with two 15-round magazines, X-Ray3 day/night sights, and an optics-ready slide—so you can mount a red dot without milling. This is the EDC sidearm that doesn’t make you choose between capacity, shootability, and concealment.
| Manufacturer | Sig Sauer |
|---|---|
| Model | P320 XCompact XSeries |
| Material | Stainless steel slide, polymer grip module (per manufacturer specs) |
| Compatibility | P320 holsters, optics with RMR/Holosun footprint, M1913 lights/lasers |
| Finish | Nitron black slide, black polymer grip |
| Weight | 25.5 oz (unloaded, with magazine) |
| Condition | New |
Key Features
- Optic-Ready Slide — Why it matters: You can mount a red dot (RMR/Holosun pattern) direct without sending the slide to a machine shop. That means faster target acquisition in low-light or high-stress drills.
- XSeries Flat Trigger — Why it matters: The flat face gives you a consistent finger placement shot after shot, and the crisp break helps you stay on target through the reset. It’s a factory trigger that feels like an aftermarket upgrade.
- XCompact Grip Module — Why it matters: The medium-size frame fits most hands without feeling blocky, and the extended beavertail plus high undercut trigger guard let you get a high grip for better recoil control.
- X-Ray3 Day/Night Sights — Why it matters: Tritium inserts glow in pitch-black, while the bright front ring works in daylight. No batteries, no switches—just reliable sight picture 24/7.
- M1913 Accessory Rail — Why it matters: You can mount a weapon light (like a Streamlight TLR-7) or a laser trainer without proprietary adapters. That’s one less headache when setting up your nightstand or EDC rig.
Who It’s For
This is for the daily carrier who wants a compact 9mm that can pull double duty as a home-defense pistol. The 3.6-inch barrel and 15-round capacity put it in the sweet spot for appendix or strong-side carry under a t-shirt. It’s also a solid pick for competition shooters who shoot Carry Optics or Production divisions and want a modular platform.
Pros & Cons
| Pros | Cons |
| Optic-ready without adapter plates (direct mount for RMR/Holosun) | Grip texture is medium-aggressive; some shooters will want stippling or a Talon grip wrap |
| Interchangeable grip modules for custom fit (small, medium, large) | Trigger pull weight is 5.5-6.5 lbs—good for carry, but competition shooters may want lighter |
| X-Ray3 sights are tritium + fiber optic hybrid | Slide serrations are functional but shallow compared to aggressive aftermarket cuts |
Comparison: Sig P320 XCompact vs. Zev OZ9 Compact vs. Agency Arms AOS G19
| Feature | Sig P320 XCompact | Zev OZ9 Compact | Agency Arms AOS G19 |
|---|---|---|---|
| Price | $729.99 | ~$1,200 | ~$1,500 |
| Barrel Length | 3.6″ | 4.17″ | 4.02″ |
| Magazine Capacity | 15 rounds | 15 rounds (Glock mags) | 15 rounds (Glock mags) |
| Optic Ready | Yes (RMR/Holosun direct) | Yes (RMR/Holosun) | Yes (Agency AOS system) |
| Trigger | XSeries flat (striker) | Zev Pro flat (striker) | Agency flat (striker) |
| Modular Grip | Yes (P320 fire control unit) | Yes (OZ9 chassis) | No (fixed polymer frame) |
| Best For | Budget-friendly modular EDC | Premium competition/custom build | High-end custom Glock alternative |
The P320 XCompact comes in at nearly half the price of the Zev or Agency builds. You lose some aftermarket bling, but you keep the modular fire control unit—swap grip modules, change calibers, or upgrade the trigger later. For the money, it’s the most versatile compact striker gun out of the box.
FAQ
Does the Sig P320 XCompact come with suppressor-height sights for co-witness with a red dot?
No, the X-Ray3 sights are standard-height day/night sights. If you mount a red dot with a deck height like the Holosun 407K/507K, you’ll get a lower 1/3 co-witness. For absolute co-witness, you’d need to swap to taller sights (like the Sig X-Ray3 suppressor-height set).
Can I use P320 full-size magazines in the XCompact?
Yes, full-size P320 17- and 21-round magazines fit and function in the XCompact. They’ll extend past the grip by about an inch, which is common for range or competition use. For carry, the included 15-round flush-fit magazines are recommended.
What holsters are compatible with the optic-ready slide?
Most P320 XCompact holsters with an open or cut-out top (for optics) will work. Brands like Vedder, Tier 1 Concealed, and Trex Arms make specific models for the XCompact with optic cut. The M1913 rail is standard for light-bearing holsters.
Is the trigger on the XCompact the same as the X-Five Legion?
No, the XCompact uses the XSeries flat trigger with a 5.5-6.5 lb pull. The X-Five Legion uses a skeletonized flat trigger with a lighter pull (around 4.5 lbs) and an adjustable stop. The XCompact trigger is still crisp and reliable for carry, but it’s not as refined as the Legion’s.
According to Sig Sauer specs, the P320 platform has been adopted by over 1,000 law enforcement agencies in the U.S., including the U.S. military as the M17/M18. That’s a solid track record for reliability under hard use.
✓ Nationwide delivery (all 50 states)
✓ Ships 1-2 business days
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Explore more: Semi Auto Handguns | Sig Sauer Pistols | Compact 9mm Pistols
Last updated: April 2026
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