Sig Sauer Pro-Cut Slide Assembly for P320 9mm, 3.9" Barrel, X-Ray 3 Suppressor Sights, R2 Optic Ready

The Sig Sauer Pro-Cut Slide Assembly for P320 9mm with 3.9" barrel is a factory-direct replacement upper designed for shooters who want to modernize their P320 Sub-Compact or XCompact pistol with optic-ready capability. This slide ships as an upper assembly only—barrel and recoil spring assembly are sold separately—so you can either retrofit an existing frame or build a complete pistol to your specs. The relief-cut design gives it a distinctive look while keeping weight down, and the X-Ray 3 suppressor-height sights are usable day or night, so you're never left guessing if your optic goes down.

Optic mounting is straightforward: the removable plate is drilled for multiple footprints (ROMEO1-PRO, ROMEO2, Delta Point Pro, and RMR with a sealing plate), and the top-accessible screw design makes installation and adjustment quick. The stainless steel construction beneath the Nitron finish is built to handle hard use, and swapping the optic plate if you change red dots later is painless.

This specific assembly is matched to 9mm barrels of 3.9" (non-threaded) or 4.6" (threaded). If you're running a different barrel length, Sig makes corresponding Pro-Cut assemblies—just verify your barrel specification before ordering. Important note: this is a slide only; you'll need to source your barrel, recoil spring assembly, and (if starting from scratch) a compatible P320 frame. Using this on a .40 S&W, .357 SIG, or .45 ACP frame will cause feeding and extraction failures, so stick with 9mm barrels only.

Whether you're building a lightweight carry setup, a range gun with modern optics, or upgrading an existing P320, this Pro-Cut slide gives you factory quality without factory compromise—and your Sig warranty stays intact.

Key Features

• Optic ready with multi-footprint compatibility (ROMEO1-PRO, ROMEO2, Delta Point Pro, RMR with sealing plate)
• X-Ray 3 suppressor-height sights for day/night use and co-witness capability
• Removable optic plate with top-accessible mounting screws
• Stylized relief cuts for reduced weight and distinctive appearance
• Stainless steel construction with Nitron finish
• Slide only—barrel and recoil spring assembly not included
• Matched to 3.9" non-threaded or 4.6" threaded 9mm barrels

Specifications

Frequently Asked Questions

What optics are compatible with this slide?

This Pro-Cut slide accepts optics on the PRO footprint and supports ROMEO1-PRO, ROMEO2, Delta Point Pro, and RMR mounting (RMR requires a Sig sealing plate). If you're planning a specific red dot, confirm it's on one of these footprints before purchasing.

Is this slide compatible with my P320 frame?

This slide is designed for P320 Sub-Compact and XCompact frames. It will work with a compatible 9mm barrel and recoil spring assembly on either platform. The slide itself does not include the barrel or recoil components, so you'll source those separately or harvest them from an existing P320.

Can I use a different barrel length with this slide?

No. This particular assembly is matched to a 3.9" non-threaded or 4.6" threaded 9mm barrel. Sig offers other Pro-Cut configurations for different barrel lengths (3.6"/4.3", 4.7"/5.5", etc.), so check your barrel spec and order the corresponding slide assembly.

Does this slide come with a barrel and recoil spring?

No. This is a slide assembly only. You must supply a compatible 9mm barrel, recoil spring assembly, and P320 frame to complete a functioning pistol. Do not attempt to use this slide with .40 S&W, .357 SIG, or .45 ACP barrels—it will not function safely or reliably.