Xs a success! - XS Sight Systems Big Dot Tritium Front for AR Mil-Spec

I've used XS sights on pistols and rifles alike and XS is up at the top of quality manufacturers. This sight in particular is one of my favorites as it is fairly large and good for close quarters. Tritium is quality bright when needed. I have some older XS sights from the early 2000's that still have a decent amount of brightness left in the tritium. I just can't seem to get rid of them because they still work, 20yrs after being manufactured!