The SIG Sauer P320 X‑Series 3.9″ Slide Assembly is a factory OEM replacement/upgrade slide built from stainless steel and finished in durable Nitron matte black. Designed for the P320 Carry/Compact footprint, it accepts SIG’s 3.9″ 9mm barrel and fits both X‑Series and non‑X grip modules, giving you full optics flexibility with a removable top plate that supports ROMEO‑series, DeltaPoint Pro (PRO) and RMR footprints. Outfitted with XRAY3 suppressor‑height day/night sights and a removable optic plate with top‑accessible screws, this slide is ideal for building or refreshing an optics‑ready P320 while maintaining factory fit and finish. (Sold as a slide assembly — barrel and recoil components may not be included; verify the retailer listing)