Forward Controls Design Trijicon RMR RMR HD RCR SRO FN 509 Tactical RMR Adapter Plate Black OPF-FN509T RMR. This FN 509 compatible mounting plate is designed to fully support the optic in the front and rear with posts that ensure minimal sight movement. The adapter plate is made of steel to increase the lifetime of the mounting plate. Specifications for Forward Controls Design Trijicon RMR RMR HD RCR SRO FN 509 Tactical RMR Adapter Plate: Manufacturer: Forward Controls Design Red Dot Sights-Footprint: RMR Optic Cut: Trijicon RCR Trijicon RMR Fabric/Material: 4140 Steel Color: Black Gun Model: FN 509 Tactical Gun Make: FN Herstal Package Contents: Forward Controls Design Trijicon RMR RMR HD RCR SRO FN 509 Tactical RMR Adapter Plate What firearm models does the manufacturer say Forward Controls Design Trijicon RMR RMR HD RCR SRO FN 509 Tactical RMR Adapter Plate is compatible with? The manufacturer says that Forward Controls Design Trijicon RMR RMR HD RCR SRO FN 509 Tactical RMR Adapter Plate is compatible with FN 509 TacticalForward Controls Design OPF-FN509T RMR: Trijicon RMR RMR HD RCR SRO FN 509 Tactical RMR Adapter Plate Black