They're here. Via Unwanted Blog.
Upside: Duh, rayguns!
Downside: Sin-ugly, slow and underpowered. Kind of like an arquebus. Kind of just exactly like an arquebus. Which grew up to be the AR-15, among other things; and the rate of change is faster these days. I would not be selling off the shiny Mylar armor just yet.
I give it, oh, three days before Massachusetts and California ban them -- and New Jersey probably already has.
5 months ago