Enjoy superior strength and stability for your optic with the C&H Precision V4 MIL/LEO Holosun® 509T Optics Mounting Plate with Rear Sight for FN 509®. Featuring a MIL-SPEC type III hard anodized coating, this mounting plate ensures long-lasting corrosion resistance and dependable service and is perfect for any high-stress tactical, target, or competitive shooting application. Steel mounting hardware (included) provides a strong, sturdy, and snug fit for your Holosun 509T, and patented stainless steel T-nut provides six to seven threads of engagement for added security and the ultimate secure fit. This mounting plate features a rear sight that can co-witness with your optic for superior accuracy and boasts CNC-machined 6061 aluminum construction for maximum strength and rigidity to ensure superior stability. Don’t hesitate and order today! Compatible with Holosun 509T optics ONLY.