10/22 Stainless with a Butler Creek collapsible stock and 30rd magazines.
You can cock it for each shot and use CB Longs to hunt small game with and it is extremely quiet, shoot carp in shallow water with high velocity solids.
If you know where all the deer are in an area if you live there, you can drop a Velocitor down a deer's ear from a tree stand if you are desperate.
The ammo is dirt cheap and you can hold a hundred rounds in a shirt pocket. In a gun fight people you are shooting at will react to it as any other weapon, and people have studied it and you can easily kill someone out to 500 yards with one.
In times of desperation the ammo would have the highest trade value as it is a good small game cartridge that many people would be able to use, and that would make the bullets very valuable in trade.
The barrel almost never needs to be cleaned with good waxed bullets and is dead accurate with no recoil and with very little noise. If you are hunting in dark days you don't want the sound of a shot traveling, as it would tell others that there was something worth shooting at and they might seek you out and ambush you for your game. You avoid this with CB Long ammo or subsonics.
Also, by being such an abundant cartridge, even if you completely run out of ammo chances are you'd run into more so the gun wouldn't be completely worthless if you were out of ammo. And the rifle is compact and light, so it would still be easy to keep around.