A friend of mine bought the tru-glo tritium front sight, it is kinda cool it comes with the sight tool. The top half will swivel on top of the bottom half so that the tritium always faces the shooter but adjusts just like the original. Because he has my old Pan-A-V holographic sight co-witnessed with his rear matech and front A2 sight. I had him take a popsicle stick (tongue depressor) and lay it along side the sighted in sight and mark the level of the top of the sight so we could swap them out and keep it sighted in. It worked great and the glow in the dark front post is really easy to see after dark. It looks just like the color of "Zombie" blood. LOL I am not sure you can buy tritium paint but if you have to paint the whole post it will be a thick after dark where the one you can buy just has a narrow line on one face that always faces the operator.