http://www.brownells.com/.aspx/pid=2...IPE-POST-SIGHT
if you want tritium.
I've found that taking a white paint marker and painting the rear side of the sight post works pretty well at night. It also makes it easier to acquire during the day. I am aware this goes against conventional logic.
http://www.wayfair.com/Sanford-Paint...FQP0nAodngEAAA
3 bux!!