Sig Sauer P320 Pro 9mm X-RAY3 ROMEO1PRO 4.7" Black Handgun

The Sig Sauer P320 Pro 9mm is a modern duty and carry platform engineered around the factory-installed ROMEO1PRO reflex sight and X-RAY3 day/night sights. This 4.7" black slide assembly combines optic-ready capability with the versatility to run co-witnessed iron sights—a genuine advantage for shooters who want both speed and a backup sight picture without the height penalties of suppressor-height hardware. Built on Sig's modular P320 architecture, the Pro slide works with Compact grip modules (both X-SERIES and standard) and accepts Sig barrels in 9mm, .357 SIG, or .40 S&W, making it a flexible choice for range work, duty carry, or sport shooting.

The ROMEO1PRO optic is mounted low enough to coexist with standard-height iron sights, preserving the familiar, consistent sight picture that matters when you need speed and confidence. The X-RAY3 night sights ensure target acquisition in low light, and the PRO footprint keeps you locked into Sig's ecosystem if you ever swap optics. The 4.7" barrel strikes a practical balance—long enough for velocity and accuracy at distance, short enough to handle smoothly in dynamic settings.

Sig's Nitron finish on the black slide is proven field hardening, designed to stand up to handling, weather, and regular use. This is a no-nonsense, purpose-built slide assembly for anyone ready to run a modern optic without abandoning the option to fall back on iron sights. Note that this is a 9mm/.357 SIG/.40 S&W platform and will not work with a .45 ACP fire control unit.

Key Features

• Factory-installed ROMEO1PRO reflex sight with co-witnessing X-RAY3 day/night sights
• Low-mounted optic allows use of standard-height iron sights as backup
• Compatible with Sig Sauer Compact grip modules (X-SERIES and non-X-SERIES)
• 4.7" barrel for balanced velocity and handling
• Accepts Sig barrels in 9mm, .357 SIG, or .40 S&W
• Black Nitron finish for durability and corrosion resistance
• PRO footprint optic mounting for lens and accessory compatibility

Specifications

Caliber	9mm Luger
Barrel Length	4.7"
Slide Finish	Black Nitron
Optic Ready	Yes
Optic Footprint	PRO (DeltaPoint Pro)
Factory Sights	ROMEO1PRO Reflex Sight + X-RAY3 Night Sights
Loaded Chamber Indicator	No
Compatible Grip Modules	Compact (X-SERIES and standard)
Compatible Fire Control Units	9mm, .357 SIG, .40 S&W (NOT .45 ACP)

Frequently Asked Questions

Will this slide work with my Compact P320 grip module?

Yes. This Pro slide is designed for Sig Sauer Compact grip modules, both X-SERIES and non-X-SERIES versions. Make sure your fire control unit is chambered in 9mm, .357 SIG, or .40 S&W—it will not function with a .45 ACP FCU.

Can I use standard-height iron sights with the ROMEO1PRO optic?

Yes—that's a key design feature of the Pro configuration. The ROMEO1PRO is mounted low enough to allow co-witnessing with standard X-RAY3 night sights, so you get both the speed of the reflex sight and a backup iron sight picture without needing suppressor-height hardware.

What barrel compatibility does this slide have?

This slide is chambered for 9mm and accepts Sig barrels in 9mm, .357 SIG, or .40 S&W. A barrel is not included with the slide assembly. For specifications on barrel length, fit, or availability, consult Sig's barrel compatibility documentation.

Is a barrel included with this slide?

No. This is a slide assembly only. You will need to source a compatible Sig barrel separately.