How do you make a airsoft plane?

To make an RC airplane capable for airsoft combat you would need an airsoft machine gun and an RC plane. you would need to find a way to trigger the gun remotely and then mount it to the plane. If you are technicly inclined you could modify the plane to use its radio controll to fire the gun, I would not advise just attaching a gun to a plane because it would be to heavy but taking it apart and mounting the barrel and the motor on the plane.