Go into a gun shop and look at the used shotguns. You will likely see some older pumps with adjustable chokes on the end of the barrel. They are decent guns and inexpensive. Usually under $200 OTD. The adjustable chokes do work even though they dont look good. Actually one of the best survival guns around. You can shoot slugs to bird shot and have the advantage of a choke. Most wont handle mags but do you really need a mag. I think a 12 gauge with a 20" barrel and a Polychoke would be an ideal survival gun. Polychoke is still around and you can send them a barrel to get a choke installed to your preferred length.
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"I would not be an old man if I had not been an armed young man." JTJ
I was taught to respect my elders but they are getting harder to find.