Aside from being able to repeatedly take a high-G beating, what would distinguish a “weapon light” from a regular LED light?
My own definition would be 1-mode only (to not accidentally slip into moonlight or SOS modes), and have a forward-clicky (momentary-on) switch.
Additionally, a simple stoopit driver (eg, just stacked 7135s, no µC to go mental).
Buuuut, that’s just me.