The Sig Sauer P320 X-Series 9mm Luger 3.6" slide assembly is a factory-genuine, optic-ready upgrade for shooters who want to add a modern reflex sight to their compact or subcompact P320. Built on the P320's modular platform, this slide swaps onto your existing lower receiver and grip module, giving you a precision-engineered upper half that's ready to mount a red dot without additional gunsmithing or machine work.
This isn't a complete gun—it's the slide only, so you'll keep your current frame, trigger, and fire control group. That makes it an affordable way to modernize an existing P320 or build a dedicated optics-ready variant. The slide features Sig's X-Ray3 day-and-night suppressor-height sights, which sit tall enough to co-witness over most reflex optics, and a DLC matte finish that resists corrosion and glare. The optic-ready platform accepts Romeo 2, Delta Point Pro, and RMR footprints (RMR requires a sealing plate), so you have flexibility in choosing your glass.
This 3.6" version pairs with standard 9mm barrels, either the non-threaded 3.6" or threaded 4.3" models. Sig makes matching X-Series slides in longer configurations for those running 3.9" or 4.7" barrels, so verify your current barrel length before ordering. The stainless steel construction and industrial DLC coating are built for duty and hard use, and this slide preserves your factory warranty—no surprises there.
Whether you're upgrading a carry gun for faster target acquisition or building a competition rig, the P320 X-Series slide assembly gives you modular flexibility and proven Sig reliability without reinventing your entire firearm.
| Caliber | 9mm Luger |
| Slide Length | 3.6" |
| Barrel Compatibility | Standard 9mm 3.6" non-threaded or 4.3" threaded barrels |
| Optic Ready | Yes—PRO footprint (Romeo 2, Delta Point Pro, RMR with sealing plate) |
| Sights | X-Ray 3 Day/Night Suppressor Height Sights |
| Slide Material | Stainless Steel |
| Slide Finish | Nitron DLC (matte black) |
| Loaded Chamber Indicator | No |
| What's Included | Slide assembly and optics plate only (barrel, recoil spring, and lower receiver not included) |
Yes. This is a slide assembly only, designed to work with any standard P320 lower receiver (fire control group). Simply remove your current slide, drop this one on, and you're ready to go. It's fully compatible with Sub-Compact, X-Compact, and Compact grip modules.
The slide is optic-ready and accepts PRO-cut footprints, which fit Sig Romeo 2, Delta Point Pro, and RMR optics (RMR requires an additional sealing plate). It does not require milling—the cut is factory-machined and ready to go.
No. This 3.6" slide is designed only for standard 9mm 3.6" non-threaded or 4.3" threaded barrels. Sig offers matching X-Series slides in 3.9" and 4.7" lengths for those barrel sizes. Check your barrel length before ordering to ensure compatibility.
No. This is a factory Sig part, and swapping the slide does not void your warranty when done correctly.
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Sig Sauer
Sig Sauer
Sig Sauer
