AmeriGlo Pro i-Dot, 2 Dot Complete Set, Tritium Night Sight, For Glock 20,21,29,30,31,32,36, Green Front Sight with Orange Outline/Green Rear Sight, ProGlo GL-203 Single Dot Rear (green tritium" no outline) featuring a .180" rear notch. Rear extends to end of slide and has an under-cut face to eliminate glare. Paired with a tritium front sight (green w/ orange outline.