Mark,
Tritium sights are simply regular steel sights with a hole drilled and a lamp or capsule that contains the phosphorus and tritium (the tritium only makes the phosphorus glow continually) is secured in the hole typically inside of a rubber type gasket to help with shock absorption.
ETA: I just took a quick peek at the Amerigun sight and they are now installing Trijicon and their own sights as well as doing the custom tritium installs in customers guns. They have a price list posted and near the top of page 1 is an option for tritium bar with replacement rear sight for $117.50. Assuming a front sight of adequate width is obtained I see no reason they wouldn't install a tritium bar.
They were super polite and up front about what they could or couldn't do and I'm sure your not the first to ask for that arrangement.
Last edited by MallardAddict; 03/23/14.
