I'm thinking of getting an M3 and want to know more about the options I have with it. It won't be bored (yet). I know there are two LA's that come with it and a couple more available from Lumens Factory. I also have looked at Nailbenders D36 drop-in thread. Now for my questions. How easy is it to switch between the drop-in and the incans? Also, what can I run with two 17500s and what would be too much for them? I may get it bored eventually so can I run more with 18500s? I'm thinking of putting a Triad Tail on it as well. Does anyone have any other general advice or is there anything I'm not thinking about?