I am looking for a picatinny rail mounted flashlight for an AR and a Shotgun that I have. However I have a few requirements: 1) I would like for it to operate off of inexpensive and common batteries such as AA or AAA. I am tired of paying for super expensive 123 batteries and others like that. 2) The light needs to be inexpensive. ~$50. I don't have a whole lot of money to spend. Anybody got any good suggestions?