The mods I know of are the clickie conversion, the glass lens, and of course a total LS conversion. The glass doesn't make much of a difference, the clickie is the clickie, and the LS just turns it into a different light. Bottom line, a PM6 is a PM6...all the praise you've heard for it here (the beam, the brightness, etc..) isn't changed by adding a clickie or a different lens...