I went to New York with my wife to visit her friend. The northeast has some pretty drastic laws and most of them don't even permit the carrying of a folding knife, much less a gun (without a permit). Way before tactical lights came out (with their crenulated edges) I carried a 2 AA cell Mini Maglight. No one can really say anything about a flashlight but the back end makes a pretty good kubaton. A bit of nylon cord attached to the end could also make it a swinging weapon.
The ATF should be a convenience store instead of a government agency!