AmeriGlo CAP - Combative Application Pistol Sight, Fits Glock 20,21,29,30,31,32,36, Green/Green, Green Tritium Font Sight with Lumi Outline, Rear Sight With Lumi Horizontal Center Line GL-615 AmeriGlo CAP (Combat Application Pistol) sets allow the shooter to align a highly visible front post with a brightly colored horizontal paint bar on the rear sight for rapid target acquisition. Point of impact is the A-Box at 15 yards when any portion of the front sight is visible in the rear notch" allowing for rapid sight alignment.