This one was my first brand new, didn't want to mess it up project. I had already experimented with some used Maglites that I didn't care to mess up. This one I told myself was going to be "IT". So I ordered this beauty from zbattery, planned the mods and went to it. It uses the $35 DX 5 LED 1200 lm module. Shortened the barrel to use 2 (18650), rethreaded the back of the barrel to thread the tailcap back on, added glass lens, opened up the light head to allow the module to fit. decreased the OD of the module at the top to allow to fit in the head, made a spacer for the 18650 batteries and deep tail cap mod. I have to say, this module is really nice. It has a tight beam with spill.