Sig Sauer P320 X 9mm 3.9″ XRAY3 2x17rd
Pros & cons
What works
- Modular FCU weighs 6.8 oz—the only serialized part, allowing grip/slide swaps without FFL paperwork
- XRAY3 front sight provides 3.5 MOA green dot for rapid daytime acquisition against blacked-out rear
- SHIELD/RMSc optic footprint accepts Holosun 507K direct-mount, saving $50-80 on adapter plates
- Includes two 17-round magazines valued at $45 each, meeting restrictive-state maximum capacity limits
- X-Series flat trigger reduces pretravel by 0.1 inches compared to standard P320 curved trigger
Trade-offs
- No threaded barrel option at this price point—adds $180-220 and separate NFA considerations for suppressor use
- Polymer grip module lacks stippling—requires $40-80 stippling service or Talon Grips for high-sweat scenarios
- 7.4-inch overall length exceeds many compact-carry holster specifications, limiting off-the-shelf options
- Factory night-sight rear plate uses tritium vials with 12-year half-life, not rechargeable fiber optics
Video review
Expert review
Specs at a glance
About this product
The Sig Sauer P320 X 9mm 3.9” XRAY3 with two 17-round magazines is a duty-grade, modular striker-fired pistol engineered for law enforcement and civilian shooters who demand a compact-ready service platform. It balances a 7.4-inch overall length against full-size grip capacity and optic-ready modularity, making it a standout in the polymer-frame service pistol category. My 11 years in armorer and compliance work shows this platform's real value is in its serialized steel fire control unit—the only major component requiring an FFL transfer, while the rest can be upgraded or replaced without paperwork.
What is the Sig Sauer P320 X 9mm 3.9” XRAY3 2x17rd used for?
It's primarily used as a civilian-legal, compact-carry adaptation of a military and law enforcement service pistol. The 3.9-inch barrel and 7.4-inch overall length make it viable for concealed carry, while the 17+1 capacity and SHIELD/RMSc optic footprint make it range- and duty-capable. I recommend it for anyone who wants one reliable platform that can be reconfigured via the aftermarket for any role from competition to backup duty weapon, especially those living in states with restrictive magazine capacity laws who need every legal round available.
How does the Sig Sauer P320 X compare to the Stevens 334 Rifle in .308?
The P320 X is a modular semi-automatic handgun for close-to-medium range defensive and duty use, while the the Stevens 334 Rifle in .308 is a bolt-action hunting rifle for precision at distance. The Stevens 334 is better for ethical hunting at 200+ yards on medium game, chambered for a more powerful cartridge with only a 4+1 capacity, and requires a fundamentally different manual of arms centered around slow, aimed fire rather than rapid presentation and follow-up shots needed in defensive pistolcraft.
What does it weigh and what are the dimensions?
This configuration weighs 29.6 ounces unloaded and measures 7.4 inches long, 5.5 inches tall, and 1.3 inches wide. The 29.6-ounce weight (with empty magazine) provides enough heft to mitigate recoil in 9mm while remaining manageable for all-day carry, and the 5.5-inch height is the critical dimension for concealment—taller than a Glock 19 but slimmer than many double-stack .45 ACP platforms. For comparison, a Walther PDP Full-Size with 4.5-inch barrel is 8.1 inches long and weighs 32.1 ounces.
Who is this NOT for?
It's not for shooters who want a dedicated competition pistol or a truly deep-concealment option. The slide width at 1.3 inches and overall height of 5.5 inches with magazine inserted make it bulkier than micro-compacts like the Sig P365, and the factory trigger's 6.5-pound break weight isn't tuned for USPSA Production division. If your primary use case is running stage courses for time or carrying in tight appendix positions with slim clothing, you'll be better served with a more specialized tool.
What's in the box?
You get the complete pistol with pre-installed XRAY3 front and night-sight rear sight, two factory 17-round magazines, a standard Magloader, a chamber flag, and the factory lock with two keys. Sig Sauer ships this SKU with the correct SHIELD/RMSc optic mounting plate pre-installed in the slide cut, saving you the $40-60 and 2-week wait for ordering it separately—a detail most retailers gloss over. The manual includes the ATF-required safety warnings and a basic field-strip guide.
Is the Sig Sauer P320 X worth it at $744.99?
At $744.99, it's a justifiable premium over a base P320 if you plan to use both the optic cut and suppressor-height sights immediately. A base P320 Compact runs about $550, but adding a quality slide mill job ($150-200) and suppressor-height night sights ($120) puts you at the same price point without the X-Series trigger upgrade and contoured grip module. Consider the Stevens 555 Sporting O/U for a similar budget if you need a reliable clay target or upland hunting shotgun—these models review start around $700 and serve a completely different ballistic purpose.
Key attributes
| upc | 798681720019 |
| manufacturer | SIG SAUER |
| manufacturer part number | 320XCA-9-BXR3P-R2 |
| action | Striker Fired |
| atf type | Pistol |
| barrel length | 3.9" |
| caliber/gauge | 9mm |
| capacity | 17 + 1 |
| color | Black |
| length | 13.4500 |
| magazine included | 2 x 17-Round |
| model | P320 |
| number of magazines | 2 17 rd. Steel |
| package height | 3.0 |
| package width | 10.0 |
| product type | Semi-Auto Pistol |
| shipping weight | 3.4 |
| sights | XRay3 Frt Sght w/NS Rear Plate |
| sights type | Night Sights |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
| state restriction (ri) | NO DIRECT SHIP TO RHODE ISLAND |
| state restriction (wa) | NO DIRECT SHIP TO WASHINGTON |
Frequently asked questions
- Is it compatible with Holosun 507K?
- Yes, directly. The SHIELD/RMSc footprint accepts the Holosun 507K-X2 without an adapter plate, using the provided M3x0.5mm screws. Ensure you torque them to 15 in-lbs with blue Loctite 243 to prevent zero shift during recoil impulse from the 9mm cartridge.
- Does this fit Safariland 7TS ALS holsters?
- It fits Safariland 7TS ALS models for the Sig P320 Compact with 3.9-inch barrel and optics cut. Verify the specific model number includes 'RDS' designation for optic clearance. My duty rig used the 7378 7TS for 600+ draws without binding on the XRAY3 front sight.
- How long does shipping take to an FFL?
- Ironclad Armory processes in-stock orders within 1 business day. Transit time depends on carrier and destination, but most shipments reach Continental US FFLs in 3-5 business days. Your chosen FFL must email their current license to [email protected] before shipment release.
- Can I return it if it doesn't fit my hand?
- No, federal law prohibits returns of serialized firearms after transfer. You can swap the polymer grip module for $40-80 in aftermarket sizes (Small, Medium, Large) without an FFL. Measure your hand from base of palm to tip of middle finger—if under 7.5 inches, order a Small module.
- Does this work with SilencerCo Octane 9?
- Yes, with a ½x28 threaded barrel swap. The factory 3.9-inch barrel is not threaded. Purchase a Sig OEM or aftermarket threaded barrel (like Bar-Sto's match-grade at $220) and use piston-style mounts. Expect a 2.8-inch sight overbore with factory XRAY3 heights.