Sig Sauer P320 X-Full 9mm 4.7″ Romeo-X, 2x17rd
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Specs at a glance
About this product
If you’re looking for a full-size, optics-ready 9mm that pulls double duty on the range and in the holster, the Sig Sauer P320 X-Full 9mm 4.7″ Romeo-X, 2x17rd is a fine choice. This striker-fired pistol comes from the factory with a Romeo-X reflex sight already mounted, XRay3 day/night sights, and two 17-round steel magazines. The XSeries grip module with its extended beavertail and undercut trigger guard gives you a solid, repeatable hold. Whether you’re running drills or standing watch at home, this setup is ready to go right out of the box.
| Manufacturer | Sig Sauer (per manufacturer specs) |
|---|---|
| Model | P320 X-Full |
| Caliber | 9mm Luger |
| Barrel Length | 4.7 inches |
| Magazine Capacity | 17 rounds (2 magazines included) |
| Overall Length | 8.0 inches |
| Weight | 29.5 ounces (unloaded, with Romeo-X) |
| Finish | Nitron (slide), stainless steel barrel |
| Grip Module | XSeries polymer with extended beavertail and undercut trigger guard |
| Sights | XRay3 day/night sights + Romeo-X reflex sight |
| Safety | Striker safety, disconnect safety, manual trigger safety (no external safety lever) |
| Condition | New |
Key Features
- Factory-Mounted Romeo-X Reflex Sight – Why it matters: You get a proven red dot zeroed from the factory, saving you the hassle of buying and mounting an optic separately. The Romeo-X uses a crisp 3 MOA dot and motion-activated illumination, so it’s ready when you are.
- XSeries Grip Module with Extended Beavertail & Undercut Trigger Guard – Why it matters: This grip gives you a higher hand position, better recoil control, and a more natural point of aim. The undercut lets you get a firm hold without pinching, especially important during fast follow-up shots.
- XRay3 Day/Night Sights – Why it matters: Even if your Romeo-X goes down, these tritium/fiber-optic sights provide a reliable backup. They co-witness through the red dot window, so you can transition without losing your sight picture.
- Two 17-Round Steel Magazines – Why it matters: You get two full-capacity mags from the factory, giving you 34 rounds total for the range or duty. The steel body and nitron finish hold up to repeated reloads and rough use.
- Optics-Ready Slide (with Romeo-X Pre-Installed) – Why it matters: The slide is cut for a direct mount, meaning no adapter plates needed. If you ever want to swap optics, the Romeo-X footprint matches the standard DPP pattern.
Who It’s For
This pistol is built for the shooter who wants a full-size duty or home-defense 9mm with a factory-installed red dot. It suits law enforcement officers, competition shooters in USPSA Carry Optics division, and anyone who prefers a larger frame for better control. If you’re a southern dove hunter who also carries a firearm for personal protection, the P320 X-Full gives you the capacity and accuracy you need.
Pros & Cons
- Pro: Factory-mounted Romeo-X saves you $150–$200 over buying separately.
- Pro: Modular grip system lets you swap frames to change size or color.
- Pro: XRay3 sights co-witness with the red dot, so you’re never without a sight picture.
- Con: No external safety lever – some shooters prefer a manual safety for holster carry. The P320 X-Full relies on internal safeties only.
Comparison
| Feature | Sig Sauer P320 X-Full | Zev Technologies OZ9 V2 | Agency Arms AOS G19 |
|---|---|---|---|
| Caliber | 9mm | 9mm | 9mm |
| Barrel Length | 4.7″ | 4.5″ | 4.02″ |
| Magazine Capacity | 17 rounds | 17 rounds | 15 rounds |
| Optics Ready | Romeo-X pre-installed | RMR cut (plate system) | Agency AOS cut (plate system) |
| Grip Module | XSeries polymer | Zev aluminum grip | Polymer frame |
| Trigger Pull | ~6.5 lbs (per Sig specs) | ~4.5 lbs | ~5.5 lbs |
| Weight (unloaded) | 29.5 oz | 27.8 oz | 24.5 oz |
| Price | $1,049.99 | ~$1,700 | ~$1,400 |
Frequently Asked Questions
Is the Sig Sauer P320 X-Full compatible with standard P320 holsters?
Yes, the X-Full uses the same slide profile as the standard P320 full-size. Most duty holsters (Safariland, Blackhawk, etc.) and many Kydex holsters will fit. However, because of the XSeries grip module, it may not fit compact-specific holsters. Always check the holster’s compatibility list.
Can I remove the Romeo-X and use the iron sights only?
Absolutely. The Romeo-X mounts directly to the slide with two screws. You can remove it and still use the XRay3 day/night sights. If you want a lower-profile cover plate, Sig Sauer sells one separately.
What is the warranty on the P320 X-Full?
Sig Sauer offers a limited lifetime warranty on the firearm and a 5-year warranty on the Romeo-X optic. Per Sig’s policy, the warranty covers defects in materials or workmanship but does not cover normal wear or misuse.
Does this pistol come with a manual safety?
No, the P320 X-Full does not have an external manual safety lever. It relies on a passive striker safety, a disconnect safety, and a trigger safety. Some shooters prefer this for a cleaner draw, while others may want a thumb safety for holster carry.
Trust & Delivery
- ✓ Nationwide delivery (all 50 states)
- ✓ Ships 1–2 business days
- ✓ 30-day returns
- ✓ Secure checkout
Last updated: April 2026
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