The Sig Sauer P320 ROMEO-X Slide (brand part no. 8901571) is a factory-replacement slide assembly for the P320 X-Series, chambered in 9mm Luger and finished in Coyote Brown with front and rear serrations for confident manipulation. Sig built the ROMEO-X PRO optic directly into this slide, mounted low enough that a shooter can still use standard-height iron sights when the optic is not in use, keeping a consistent sight picture whether the dot is active or not. That low mount also means the slide doesn’t require tall suppressor-height iron sights just to co-witness with the optic. This RXP designation marks Sig’s reflex-optic-ready X-Series slide pattern, and this Stainless Steel RXP X-SERIES slide assembly fits Full, Carry, and Compact size grip modules across both X-SERIES and non-X-SERIES frames. It’s built to accommodate Sig’s 4.7-inch barrel, which is sold separately, and it’s built for P320 owners upgrading toward a factory-integrated reflex optic setup without hunting down a separate optic and mounting plate.

Key Specifications

• Chambered in 9mm Luger.
• Machined from stainless steel.
• Finished in Coyote Brown.
• Cut with front and rear serrations for slide manipulation.
• Built with a factory-installed ROMEO-X PRO optic mounted low over the slide.
• Compatible with standard-height iron sights without needing suppressor-height sights.
• Carries the RXP designation, Sig’s reflex-optic-ready X-Series slide pattern.
• Fits Full, Carry, and Compact size grip modules, X-SERIES and non-X-SERIES.
• Accommodates a 4.7-inch barrel (sold separately).

Frequently Asked Questions

Does this slide come with a barrel? No, it accommodates a 4.7-inch barrel, which is sold separately.

Do I need suppressor-height sights to use the ROMEO-X optic? No, the ROMEO-X PRO optic sits low enough to co-witness with standard-height iron sights.

What grip modules fit this slide? It fits Full, Carry, and Compact size grip modules across both X-SERIES and non-X-SERIES P320 frames.

Buy the Sig Sauer P320 ROMEO-X Serrated Slide, 9mm, Coyote Brown

Upgrade your P320 with a factory optic-ready slide built for a consistent sight picture. Order it through our Sig Sauer lineup of handgun slides from our Lubbock, Texas gun shop.