I just ordered up some XS big dots for a very good price ($101.93 with 2 day shipping) and I am very excited to get them and install them. One thing that I couldn't seem to find anywhere is what color the tritium viles are. I have never installed XS sights, but if the installation is the same as regular night sights then I dont think I'll have a problem. My question is has anyone ever had a problem with the rear sight falling off or breaking the tritium vile? I heard from one guy he said the recoil of his glock caused the vile to break, but I don't believe that for a second. I know that the sight picture from close range to 15 yards is just supposed to be the dot covering the target. Anything past that should be the top of the dot on the target. Is this correct?