Upgrade your SIG Sauer P320 X-Five, M17, or M18 pistol with the C&H Precision V4 Optic Plate, engineered specifically to adapt Romeo1Pro or DeltaPoint Pro optic cuts for the Holosun 509T enclosed-emitter red dot sight. Precision-machined from durable mild-grade steel, this adapter delivers a rock-solid mounting solution that maintains zero under recoil for duty, competition, or defensive applications. Key Features Steel construction for superior strength and longevity compared to aluminum or polymer alternatives V4 MIL/LEO thickness of .095 to .099 maintains a low-profile fit without altering pistol ergonomics Precision CNC machining on HAAS equipment ensures tight tolerances and repeatable optic alignment MIL-SPEC Type III hard anodized black finish provides corrosion resistance and a professional tactical appearance Stainless steel mounting hardware included for secure, replaceable installation Specifications Material: Mild-grade steel Finish: MIL-SPEC Type III hard anodized black Thickness: .095-.099 Includes: 1 optic plate and 2-3 M4 plate mounting screws