What happens when a GA pilot squawks 7500? If you were to put code 7500 into your transponder in a small general aviation aircraft, and you were in a rural area with no one around, and you did not have enough fuel to get to any city, what happens? Would they shoot you down? {edit what I meant was if you were being Hijacked and you on purpose sqacked 7500
Who would shoot you down and why? You are in the middle of nowhere. Who are you endangering? ATC would try to contact you to ascertain your actual condition. You may have accidentally put in the wrong code. They would then offer assistance if needed. 

If it was a kidnapping situation, all they could do is follow or track you until you land. You are not going to get far. Even if you went to another country close by, you can still be tracked and local authorities alerted.