Sig Sauer P320 X 9mm 3.9″ XRAY3 2x17rd
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About this product
The Sig Sauer P320 X 9mm 3.9" XRAY3 2x17rd is a striker-fired, modular handgun that splits the difference between a full-size duty gun and a compact carry piece. With a 3.9-inch barrel, two 17-round magazines, and XRAY3 night sights, it delivers a proven platform for shooters who want one gun that can do it all—range time, home defense, and concealed carry. Per Sig Sauer specs, the X-series frame gives you an aggressive grip texture and a higher bore axis control, making this one of the most shootable P320 variants out of the box.
| Manufacturer | Sig Sauer |
|---|---|
| Model | P320 X |
| Material | Stainless steel slide, polymer X-series frame |
| Compatibility | SHIELD/RMSc footprint optics, Picatinny rail accessories |
| Finish | Nitron black slide, black polymer frame |
| Weight | 25.5 oz (unloaded, per manufacturer specs) |
| Condition | New |
Key Features
- X-Series Grip Module: The aggressive texture and flared magwell give you a locked-in grip under recoil—WHY IT MATTERS: faster follow-up shots and more control in high-stress situations.
- XRAY3 Night Sights: Tritium front and rear with a green front ring—WHY IT MATTERS: instant low-light target acquisition without needing a WML.
- 3.9-Inch Barrel: Balances concealability with a longer sight radius—WHY IT MATTERS: you get a 17-round grip length but a slide that's easier to appendix carry than a full-size 4.7-inch model.
- Optic-Ready Slide (SHIELD/RMSc Footprint): Pre-milled for micro red dots—WHY IT MATTERS: no need to send the slide out; mount an optic in minutes and co-witness with the XRAY3 irons.
- Two 17-Round Magazines: Standard capacity for 9mm—WHY IT MATTERS: you get backup rounds right out of the box, plus compatibility with P320 21-rounders for the range.
Who It's For
This is for the daily carrier who wants a modular platform that can shift from IWB carry to nightstand duty without buying a second gun. It's also for shooters who prefer a striker-fired trigger with a crisp break and short reset, and who want the option to add a red dot later. If you've been carrying a Glock 19 but wish the grip felt more natural or the sights were better from the factory, the P320 X is worth a hard look.
Pros & Cons
- Pro: Modular fire control unit lets you swap grip sizes and calibers (9mm, .40, .357 SIG, .45) with one serialized chassis.
- Pro: XRAY3 sights are among the best factory night sights—no need to upgrade unless you want an optic.
- Con: The grip module is wider than a Glock 19's, which can be a dealbreaker for shooters with smaller hands or those looking for a slim carry profile.
Comparison: P320 X vs. Zev Technologies OZ9 vs. Agency Arms AOS
| Feature | Sig Sauer P320 X | Zev Technologies OZ9 | Agency Arms AOS (Glock 19) |
|---|---|---|---|
| Caliber | 9mm | 9mm | 9mm |
| Barrel Length | 3.9" | 4.0" | 4.0" |
| Capacity | 17+1 | 17+1 | 15+1 |
| Optic Footprint | SHIELD/RMSc | RMR (via plate) | RMR/Holosun (AOS cut) |
| Trigger | Striker-fired, 5.5–6.5 lb pull | Striker-fired, 4.5 lb pull | Striker-fired, 5.5 lb pull |
| Weight (unloaded) | 25.5 oz | 26.5 oz | 23.5 oz |
| Price | $744.84 | $1,200+ | $1,000+ |
| Modularity | Full (FCU-based) | Full (chassis-based) | Limited (Glock frame) |
Compared to the Zev OZ9, the P320 X is a better value if you don't need a competition-grade trigger and a billet slide. The Agency AOS gives you a Glock 19 with a premium optic cut, but you lose the modularity of the Sig's FCU. For EDC, the P320 X wins on capacity and factory night sights out of the box.
FAQ
Does the Sig Sauer P320 X 9mm 3.9" XRAY3 come with a holster?
No, it ships with a lockable hard case, two 17-round magazines, and the XRAY3 night sights. Holsters are sold separately. Because of the X-series grip and the Picatinny rail, you'll need a holster made for the P320 X (or P320 compact with 3.9" barrel).
What optics fit the P320 X slide?
The slide is cut for the SHIELD/RMSc footprint, which includes the Sig Sauer ROMEO Zero, Shield RMSc, Holosun 507K, and Swampfox Sentinel. You can also use an adapter plate for RMR-footprint dots, but direct mount is cleaner.
Can I use P320 21-round magazines in this pistol?
Yes. The P320 X accepts all P320 magazines: 10-round, 17-round, 21-round, and 30-round. The 21-rounders will stick out past the grip, but they're great for range use or home defense.
Is the P320 X California-legal?
No, this model is not on the California roster. Check your state's laws before ordering. We ship to all 50 states, but compliance is your responsibility.
Ready to Add the Sig Sauer P320 X to Your EDC Rotation?
This pistol gives you a proven platform with factory night sights, an optic-ready slide, and a modular grip system—all at a price that undercuts the custom shop builds. Whether you're upgrading your carry gun or building out a do-it-all firearm, the P320 X is a solid choice.
- ✓ Nationwide delivery (all 50 states)
- ✓ Ships 1–2 business days
- ✓ 30-day returns
- ✓ Secure checkout
Browse more Semi Auto Handguns or check out our Sig Sauer collection for more modular options. Last updated: April 2026.