Get an accurate pellet gun in .177 cal. 600 fps is all you need. Get a good scope on it, and you can get a moderator for it to quiet it down even more. Head shots and they don't run around after being hit.
If you can swing it, get a PCP. (Pre charged pneumatic) put a moderator on one of them and you will hardly hear it - the neighbors sure can't.
If you can swing it, get a PCP. (Pre charged pneumatic) put a moderator on one of them and you will hardly hear it - the neighbors sure can't.