The C & H Precision Agency Optic System Cut Steel Plate for Holosun 509T with Integrated Rear Sight is a precision-machined steel optic mounting plate designed specifically for Agency Optic System cut pistols, providing a direct and secure interface for the Holosun 509T red dot sight with the added benefit of an integrated rear sight for reliable co-witness capability. Machined from steel to exacting tolerances, it delivers superior durability and a rock-solid repeatable optic mounting solution that eliminates the need for adapter plates or modifications to the slide. The integrated rear sight ensures shooters retain a usable iron sight backup alongside their mounted Holosun 509T, providing an additional layer of reliability for duty carry and defensive applications where optic failure is not an option. The steel construction offers enhanced rigidity and longevity over aluminum alternatives, making it particularly well suited for duty carry and high-volume training applications where long-term reliability is critical. Purpose-built for a precise fit, this steel mounting plate with integrated rear sight is the ideal solution for any Agency Optic System cut pistol shooter looking to run a Holosun 509T with maximum confidence and backup sighting capability. C& H Precision Agency Optic System Cut Steel Plate For Holosun 509T w/ Integrated Rear Sight AOS-509T-RSR-ST