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

The Sig Sauer P320 X-Series 9mm slide assembly with 3.9" barrel gives your P320 a factory-engineered upgrade path. This is the slide only—barrel and recoil assembly sold separately—so it's ideal if you're building a custom P320 or replacing a worn component. It's milled optic-ready from the factory, comes dressed in suppressor-height X-Ray 3 sights, and wears a durable DLC matte finish over stainless steel that'll stand up to hard use.

The optic-ready cut accepts Romeo 1 Pro, Romeo 2, Delta Point Pro, and RMR footprints (RMR install requires the included sealing plate), giving you flexibility to mount your preferred red dot. The X-Ray 3 day/night suppressor sights stay visible behind a mounted optic—a real advantage for shooters running cans or planning to. The removable flush-fit optics plate features top-accessible screws, so you're not fumbling with the gun upside down at the bench.

This 3.9" slide pairs with standard 9mm sub-compact, X-Compact, and Compact P320 grip modules. It's 9mm only—not compatible with .40, .357, or .45 frames. Because it's a factory Sig Sauer part, it won't void your warranty, and it's built to the same tight tolerances as the complete guns.

Key Features

• Optic-ready PRO-cut slide—accepts Romeo 1 Pro, Romeo 2, Delta Point Pro, and RMR (with sealing plate)
• X-Ray 3 suppressor-height day/night sights—visible behind mounted optics
• Removable, flush-fit optics plate with top-accessible mounting screws
• Durable DLC matte finish over stainless steel
• Compatible with P320 sub-compact, X-Compact, and Compact grip modules
• Factory Sig Sauer part—does not void warranty

Specifications

Frequently Asked Questions

Is this slide compatible with all P320 grip sizes?

No. This 3.9" slide is designed for P320 sub-compact, X-Compact, and Compact grip modules. It is not compatible with full-size grip frames.

Will this slide work with my existing P320 barrel and recoil spring assembly?

This assembly is designed to pair with standard 9mm barrels. The 3.9" non-threaded barrel and 4.6" threaded barrel will work with this slide. You'll need to source your own barrel and recoil spring assembly if you don't already have them—they're not included.

What red dots can I mount on the optic-ready cut?

The PRO-cut slide accepts Romeo 1 Pro, Romeo 2, Delta Point Pro, and RMR footprints. If you're mounting an RMR, you'll need the included sealing plate.

Will installing this slide void my P320 warranty?

No. This is a factory Sig Sauer part, and using it as a replacement or upgrade will not void your warranty.