it would be so cool if you mounted one of those guns to the plane or a heli in fact and try shooting eachothers plane down.
you could also try the inferred set up of some of the tank and heli hobbyking sell to bring down each-other
They should a paintball challenge V2. Where with the help of David, they make an automated quad with motion sensor programmed cameras that have an automatic paintball marker which will shoot anything that moves. (What would anyone use such a quadcopter for? = Going to a soccer game and flying it past the crowd.)