What is the most dangerous airsoft gun?

THe most dangerous airsoft gun is probably any of the Systema PTW series if they have the highest power cylinder. With it they can shoot at approximately 700 fps. A highly moded gas sniper rifle may also be able to achieve similar power, but I am not aware of any other airsoft gun that can shoot over 500 fps stock. Also, the Systema PTW has an absurdly high rate of fire, so it can deliver bb after bb. Most people who use these guns us weaker cylinders though, so in an airsoft game you will never have to worry about anything over 500 fps, and most guns will be around, if not lower, than 400 fps.