I am looking for a CQB sight for my M4 Bushmaster. I am thinking about either an EOTECH, Aimpoint or possiblt a C-More. Although the Trijicon reflex is probably better than any of the above because it doesn't need batteries but I remember in years past some tritium sights had about a 10 year life span because of half-life. Is this still an issue? As i've gotten older the standard battlesights don't work as well with dimming vision. Any advice would be a help.