Very clearly based on the legendary AC-130, upon activating group 4 the plane will tilt to the right and push the nose up, I call it "gunner mode" because why not. To go back to normal flying mode you have to turn the throttle to 0, then deactivate 4, then you can return to flying normally. Each gun itself is activated by groups 1, 2 ,and 3. Group 1 is the 250mm cannon, group 2 is the 100mm auto cannon, and group 3 is the 50mm Gatlin gun from my F-286-2 "Sky Reaper." To use each gun I highly consider turning the other two gun groups off or esle you will onnly get 1 shot out of the auto cannon, and 9 shots (if that) from the gatlin gun. One other thing is that it can take off on water so in a way it is a boat too.