Trijicon HD Night Sight Set for FN 509 w/ Orange Front Outline. These Tritium Pistol Sights developed by Trijicon were specifically created to address the needs of tactical shooters. The three dot green tritium night sight set's front sight features a taller blade and an aiming point ringed in photoluminescent paint while the rear sight is outlined in black and features a wider U-shaped notch. This unique configuration increases visibility and quickens front sight acquisition even in transitional lighting. Additionally the front surface of the rear sight is steeply hooked to assist in emergency one-handed slide operation. The Trijicon HD Gun Sights are designed to shine even in the most demanding conditions. Specifications for Trijicon HD Night Sight Set for FNH: Manufacturer: Trijicon Gun Make: FN Herstal Color: Green Fabric/Material: Metal Gun Type: Pistol Attachment Type: Professional installation recommended. Features of Trijicon FN HD Night Sight Set: Fits FNS-40 FNX-40 and FNP-40 Package Contents: Trijicon FNH HD Night Sight Set - .40 Trijicon 600992: HD Night Sight Set for FN 509 w/ Orange Front Outline