Yeah most of the older/original mods that took 16340's will take CR123s are they are dimensionally the same. BTW CR123'S are non-rechargeable and should be labeled RCR123's if rechargeable and are 3.0v instead of 3.7v nominal like a 16340 Li-ion(Li-CoO). Original GGTB's, GLV2, Super-t Precise...