Trijicon Suppressor/Optic Height Sights, Fits Glock 17,17L,19,22,23,24,25,26,27,28,31,32,33,34,35,37,38,39, Black Front/Black Rear with Green Lamps GL201-C-600661 TRIJICON SUP NS SET FOR GLK 9MM B/B: Trijicon Bright & Tough(TM) Night Sights are three-dot iron sights that increase night-fire shooting accuracy by as much as five times over conventional sights. Equally impressive" they do so with the same speed as instinctive shooting - and without the need for batteries.