You can get back at your gun toting neighbor by ratting him out. Place a sign on your property stating "NO GUNS ALLOWED HERE. If you have guns go to our gun loving neighbor's house (and list the address)."
Ok, we know what you may think: "ya know, I'm not a member of the Criminal Guild, but how can I help secure a stable future for America (and the World)?" Well it's easy, and it won't cost you much money to start your own gun free zones where you live, work, or otherwise spend time.