That is absolutely unconscionable! First: what are the laws on chicken-keeping where you live? If your birds are legal, call the cops on the neighbor. What they did is cruelty to animals, not to mention criminal trespass. Your birds were on your property and they had no right to shoot into your yard for any reason. If the neighbor makes another attempt to shoot at your birds, try to get a pic of them doing it and send that to the cops. If there is any doubt about the legality of your birds, though, you could cause trouble for yourself if you report them.
Glad to hear that they have a new, safe coop. They will be protected from predators now, winged, 4-legged, and 2-legged. Can't wait to see pics!