Sig Sauer P320 Full-Size 9mm Pistol with X-RAY3 Sights & ROMEO1PRO Optic, 3.9" Barrel, Black

The Sig Sauer P320 Full-Size 9mm with ROMEO1PRO optic and X-RAY3 sights is a modern carry and duty pistol built for shooters who want red-dot speed without sacrificing backup iron sights. This is a slide assembly designed around Sig's low-profile ROMEO1PRO reflex sight—which sits low enough on the slide to co-witness with standard-height iron sights, eliminating the need for expensive suppressor-height sight setups. That means faster target acquisition in any light, with irons ready if you need them.

What sets this P320 apart is its Two Port Slide Integrated Expansion Chamber. Unlike traditional compensated slides, this system mitigates recoil and helps tame muzzle rise without the maintenance headaches or overly tall profile of ported designs. The result: quicker, more controlled follow-up shots. The nitron-finished stainless steel slide is durable and corrosion-resistant, and the front cocking serrations give you a sure grip for press checks and tactical reloads. Field stripping remains straightforward—no exotic disassembly required.

The included X-RAY3 day/night sights are proven Sig standard-height iron sights that co-witness perfectly with the ROMEO1PRO. The 2 MOA red dot is precise for precision work; the 32 MOA circle helps you stay on target in dynamic situations. Compatible with factory 3.9" barrels and full-size P320 recoil spring assemblies (sold separately), this slide transforms your P320 into a modern, optic-ready duty gun without the complexity.

Key Features

• ROMEO1PRO reflex sight with 2 MOA red dot and 32 MOA circle
• X-RAY3 day/night iron sights with true co-witness to optic
• Two Port Slide Integrated Expansion Chamber for recoil mitigation
• Nitron-finished stainless steel slide for durability and corrosion resistance
• Forward cocking serrations for positive slide manipulation
• PRO footprint optic mounting (DeltaPoint Pro compatible)
• Standard field strip disassembly—no special tools or procedure

Specifications

Frequently Asked Questions

Will standard P320 barrels and recoil springs work with this slide?

Yes, this slide is compatible with factory 3.9" barrels and full-size P320 recoil spring assemblies. These components are sold separately.

Do the iron sights work with the red dot sight, or do I have to choose?

The X-RAY3 sights are standard height and sit in true co-witness with the ROMEO1PRO optic. You get both—iron sights remain visible alongside the red dot without bulky suppressor-height hardware.

What's the difference between this integrated compensator and traditional ported slides?

The Two Port Slide Integrated Expansion Chamber is designed to mitigate recoil and help control muzzle rise while keeping the overall profile lower than traditional compensated slides. It also requires less maintenance than heavily ported designs.

Is field stripping this slide different from a standard P320?

No. Disassembly remains as straightforward as any standard P320—no special tools or unusual procedures.