What pistol is the light for? Why not get a torch with a tactical grip ring on the back, this works well with the cigar type hold and a two handed pistol grip. This is the CSI style, as the pistol can still be put into a holster or the torch can be used on its own. I use a fenix TK11 with a single Li-ion battery. What ever torch you go for single cells are always better than multiples as the different charging rates of these types of batteries is some times dangerous. Good luck, hope this helps.