I'm thinking about getting a Remington 870. Are new ones as good as old ones? I'm after something I could use to clobber birds after our corn. They get in there and strip top of ears in the green stage, after which the rest gets taken by aphids or mold. Possibly hunt deer, too, as the closest area is shotgun only. I think I want replaceable chokes, which used guns often don't have. Unfamiliar with shotguns. Have never fired one.