Sig Sauer P320 X-Full 9mm 4.7″ Romeo-X, 2x17rd
About this product
The Sig Sauer P320 X-Full 9mm 4.7″ Romeo-X is a full-size, optics-ready striker-fired pistol that comes suppressor-ready and includes a mounted Romeo-X reflex sight and two 17-round magazines. Built on Sig's modular P320 platform, this configuration represents the service pistol standard that won the U.S. Army M17/M18 contract. The 4.7-inch barrel provides ballistic advantages over compact models, making it suitable for both duty use and competitive shooting applications.
What is the Sig Sauer P320 X-Full used for?
This pistol serves equally well as a duty weapon, competition firearm, or home defense platform. The 4.7-inch barrel delivers approximately 25-30 feet per second higher muzzle velocity than a 4-inch barrel, improving terminal ballistics. With suppressor-height XRay3 night sights as backup and the Romeo-X's 3 MOA dot, it transitions seamlessly between close-quarters and precision shooting scenarios.
How does the P320 X-Full compare to the Stevens 334 Rifle?
The P320 X-Full offers rapid engagement of multiple targets where the Stevens 334 .308 Win excels at single-shot precision. While the Stevens 334 delivers sub-MOA accuracy at 100 yards, the P320's 17+1 capacity allows engaging multiple threats in under 4 seconds. For home defense in confined spaces, the pistol's 8.5-inch overall length is more maneuverable than a 40-inch rifle.
What does it weigh and what are the dimensions?
Unloaded weight is 28.7 ounces with an overall length of 8.5 inches and height of 5.5 inches with magazine inserted. The 4.7-inch cold hammer-forged barrel provides optimal sight radius while keeping the pistol balanced for rapid follow-up shots. At 1.4 inches wide, it's slim enough for duty holsters but may require larger concealment options.
Who is this NOT for?
Concealed carry permit holders seeking deep concealment should consider compact alternatives. The full-size frame prints noticeably under light clothing, requiring dedicated holsters and wardrobe considerations. Shooters with smaller hands may find the XSeries grip module's circumference challenging without aftermarket small grip panels.
What's in the box?
You receive the complete pistol with mounted Romeo-X optic, two 17-round steel magazines, and all factory documentation. The optics plate remains installed unlike many competitors that ship optics separately. Total package weight is 3.2 pounds including the hard case and all components.
Is the P320 X-Full worth it at $805.99?
At this price point, it represents significant value given the included Romeo-X optic typically retails for $350 alone. Compared to building a similar configuration separately, you save approximately $150 while getting factory-zeroed optics. For shooters needing a suppressor-ready duty pistol with modern sighting systems, this eliminates multiple aftermarket purchases.
Specs at a glance
Video review
Pros & cons
What works
- Factory-mounted Romeo-X optic saves $150 vs separate purchase
- 28.7 oz weight balances perfectly for rapid follow-up shots
- Suppressor-height XRay3 sights co-witness with optic
- Modular grip system allows $45-65 customization
Trade-offs
- Full-size frame requires dedicated concealment holsters
- Romeo-X uses proprietary footprint limiting optic choices
- No threaded barrel included - adds $180 for suppressor use
- XSeries grip may be too large for shooters with small hands
Expert review
Key attributes
| upc | 798681691739 |
| manufacturer | SIG SAUER |
| manufacturer part number | 320XF-9-BXR3-RXX |
| action | Semi-Auto |
| barrel length | 4.7" |
| caliber/gauge | 9mm |
| capacity | 17 |
| color | Black |
| length | 13.3500 |
| magazine included | 2 x 17-Round |
| model | P320 |
| number of magazines | 2 |
| product type | Striker Fired |
| shipping weight | 3.4 |
| sights | Night Sights |
| sights type | Night Sights |
| slide description | Optic Cut/Serrated |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
| state restriction (il) | NO SALE TO ILLINOIS PICA |
| state restriction (ri) | NO DIRECT SHIP TO RHODE ISLAND |
| state restriction (wa) | NO DIRECT SHIP TO WASHINGTON |
| atf type | Pistol |
| package height | 2.9 |
| package width | 9.9 |
Frequently asked questions
- Is it compatible with suppressor attachments?
- Yes, the 4.7-inch barrel features suppressor-height sights and threaded options are available from Sig Sauer. The Romeo-X optic maintains zero even with heavy cans, and clearance is sufficient for most 9mm suppressors. You'll need a separate threaded barrel model for direct attachment.
- Does it fit standard P320 holsters?
- It fits most full-size P320 holsters but requires light-bearing models for weapon-mounted lights. The Romeo-X adds approximately 0.3 inches of width, so check holster compatibility specifically for optics-ready models. Safariland 6390RDS models accommodate this configuration perfectly.
- How long does shipping take to Montana?
- FFL shipments typically arrive in 3-5 business days via FedEx Priority Overnight. All firearms ship within 24 hours of FFL verification completion. Rural destinations like Bozeman may add 1 extra day for final delivery.
- Can I return it if the grip doesn't fit my hand?
- Firearms cannot be returned after transfer, but the modular grip system allows inexpensive swaps. Small, medium, and large XSeries grip modules range from $45-65 at Ironclad Armory. We recommend handling a display model before purchase if possible.
- Does this work with Trijicon RMR plates?
- The Romeo-X uses Sig's proprietary footprint, not the RMR pattern. Conversion plates are available from CHPWS for $75 but add 0.15 inches of height. For direct mounting, stick with Sig's Romeo or Delta Point Pro optics lines.
- What's the battery life on the Romeo-X?
- The Romeo-X delivers approximately 20,000 hours on medium setting with a CR1632 battery. Auto-brightness mode extends this significantly, and the top-loading battery tray requires no re-zeroing during changes. Always keep spare batteries in your range bag.