What Ameriglo has learned from their award-winning U.S. Federal Government contract sights, they've put into the AMERIGLOA(R) Trooper sight set. This three-dot design offers an instant sight picture and proven accuracy you can trust to defend night and day. The Trooper Series comes with a ProGlo front sight and a serrated square notch rear sight with green tritium. Fits: GlockA(R) Gen 1-4 17,19,22,23,24,26,27,33,34,35,37,38,39