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The Forward Controls Design FN 509 Optic Mounting Plate (OPF-FN509T-RMR) is a precision-machined interface that lets you mount an RMR-compatible red dot sight to your FN 509 series pistol. It is designed specifically for the FN 509 platform, so the plate seats correctly on the slide and holds the optic securely.
Adding a red dot to your FN 509 improves target acquisition and accuracy, and this plate provides the stable, dedicated mounting surface that setup requires. Professional installation is recommended.
