Shotgun... I care not for what some guide says. The ammo is fairly common and you can reload your own shells with shot which is useful in a survival situation. You can also keep up a constant rate of slow fire if necessary (fire-load 1 shell-fire and so on). Failing that a pair of Colt 1911s because 10mm rounds arn't that rare and they have good stopping power. Not necessarily to be used akimbo, more so I can pull second one if there is not enough time to reload.