Sig Sauer Pro-Cut Slide Assembly for P320 9mm, 4.7" Barrel, X-Ray 3 Suppressor Sights, R2 Optic Ready

The Sig Sauer Pro-Cut Slide Assembly for P320 9mm is a factory-direct replacement slide engineered for shooters building or upgrading a modern carry or duty pistol. This specific assembly fits P320 frames and is cut for a 4.7" non-threaded barrel or 5.5" threaded barrel, making it a versatile choice for both suppressor-ready and standard setups. It arrives topped with X-Ray 3 suppressor-height sights—Sig's day/night tritium design that co-witnesses below most optics—and is pre-milled for optic mounting. Whether you're customizing a defensive pistol, building a range gun, or setting up a suppressed host, this slide gives you the precision and flexibility of a factory part with the modern ergonomics Sig's Pro-Cut styling delivers.

The slide itself is machined from stainless steel and finished in black Nitron, a hard-anodized surface that resists wear and corrosion in the field. The stylized relief cuts aren't just visual appeal—they reduce overall weight while maintaining structural integrity. The optic-ready top is milled to accept ROMEO1-PRO, ROMEO2, Delta Point Pro, or RMR footprints (RMR mounting requires a sealing plate), and it includes a removable optics plate with top-accessible mounting screws for fast installation and zero changes. This is the slide assembly only; you'll need to source your own barrel, recoil spring assembly, and frame to complete the build.

Because this is a genuine factory Sig component, it won't void your P320 warranty. The 9mm-only caliber designation is crucial: it's not compatible with .40 S&W, .357 SIG, or .45 ACP barrels or parts. If you're running a P320 in any of those calibers, this assembly won't function. For builders, hunters planning a pistol-caliber carbine conversion, or anyone looking to modernize an existing P320, this slide assembly handles the heavy lifting.

Key Features

• Factory Sig Sauer Pro-Cut slide assembly for P320 frames
• Optic-ready top milled for ROMEO1-PRO, ROMEO2, Delta Point Pro, or RMR footprints
• X-Ray 3 suppressor-height tritium/fiber sights for co-witness with mounted optics
• Stainless steel construction with black Nitron finish for durability
• Stylized relief cuts reduce weight without sacrificing strength
• Removable optics plate with top-accessible screws for easy mounting
• Compatible with standard 4.7" non-threaded or 5.5" threaded 9mm barrels
• Warranty-safe factory component

Specifications

Caliber	9mm Luger only
Barrel Length Compatibility	4.7" non-threaded or 5.5" threaded
Slide Material	Stainless Steel
Slide Finish	Black or Coyote Nitron
Sights	X-Ray 3 suppressor-height, day/night tritium
Optic Ready	Yes—ROMEO1-PRO, ROMEO2, Delta Point Pro, RMR (with sealing plate)
Optic Footprint	PRO (Delta Point Pro) and other listed patterns
Loaded Chamber Indicator	No

Frequently Asked Questions

Is this P320 slide compatible with my existing P320 frame?

Yes, this Pro-Cut slide assembly fits standard P320 frames. It is the slide only—you'll need to transfer your own barrel, recoil assembly, and firing control group to complete the gun, or source those parts separately.

Will this work with my P320 in .40 S&W or .45 ACP?

No. This assembly is 9mm only and is not compatible with .40, .357 SIG, or .45 ACP calibers. Attempting to use a 9mm slide on a different caliber frame will not function safely.

What optics can I mount on this slide?

The slide is milled to accept ROMEO1-PRO, ROMEO2, Delta Point Pro, and RMR footprints. RMR mounting requires an additional sealing plate. The optics plate is removable and includes top-accessible screws for installation and zeroing.

Do the X-Ray 3 sights work under the optic?

Yes. The X-Ray 3 sights are suppressor-height, designed to co-witness below most mounted optics so you have a backup aiming reference if your optic fails or you need to transition to irons.