looks like im off to tear apart some electronics i have laying around to find one of these regs. i built a magnum mod from a flashlight but i kept the battery pack that it came with. i used 3 li-poly batteries that were out of some old smoke51 batts that i had layin around and i have em wired in parallel so im only gettin 3.9v usually. id like to wire 2 in series and make it a 5v mod. if i can find one of these regs layin around ill put it together and post my results