So, here's the thing, if you are doing nothing illegal with it and flying it according to FAA rules, you have nothing to worry about. Except for some irate neighbor that shoots your quad out of the air, he has to deal with the police for discharging a firearm in the city limits. For you, your choice is to sue him if your quad was that Phantom 4 or just salt his front lawn while he's in jail for that firearm charge. Just don't get caught.