C&H Precision Weapons Optics Adapter Plate Fn Fnx-45 V4 Mil/leo Steel Holosun 509T. Since all the mounting hardware is replaceable if any mounting hardware is damaged it can be replaced without replacing the entire plate. Mounting screws included. Specifications for C&H Precision Weapons Optics Adapter Plate Fn Fnx-45 V4 Mil/leo: Manufacturer: C&H Precision Weapons Red Dot Sights-Footprint: Holosun 509T Optic Cut: FN MRD Fabric/Material: Stainless Steel Color: Black Finish: Black Package Contents: C&H Precision Weapons Optics Adapter Plate Fn Fnx-45 V4 Mil/leo C&H Precision Weapons FNX45-509T-ST: Optics Adapter Plate Fn Fnx-45 V4 Mil/leo Steel Holosun 509T