If you had to pick one gun, only one, for survival, what would it be? I think I would choose a 12 Ga. pump, probably a Remington 870. With a supply of field loads with 6's or 7 1/2's, some OO Buck, and some good old 1 oz. rifled slugs I think you could handle a lot of different situations from defense to feeding you and your family. Finding ammo along the way probably would not be too hard either.