Sig Sauer OEM Replacement 9mm Luger for Sig P320 (3.90" Barrel), Black Stainless Steel, Optic Cut, XRAY3 Suppressor Sights For use with: Standard 9mm, 3.9" non-threaded, or 4.6" threaded barrels. P320 Compact (non-X-Series), Carry, and Full size (X-Series and non-X-Series) grip modules. Factory replacement Slide Assembly for the P320 Compact (non-X-Series), Carry, and Full size (X-Series and non-X-Series) grip modules. Features: Optic ready. Compatibility: ROMEO1-PRO, ROMEO2, Delta Point Pro, and RMR (requires sealing plate) footprint. XRAY3 Day/Night Suppressor height sights Durable Nitron PVD matte black finish Removable optics plate with top accessible screws