The idea is a survival gun that can shoot multiple different rounds in case you are scrounging ammo. The 22lr adapter makes the most sense as you can take small game and carry a lot of it. It allows the use of slugs for dangerous predators or larger animals. Takedown and folding shotguns are easier to store in an aircraft, ATV, snowmobile or in a backpack. 20 rounds of 12 gauge and 200 rounds of 22lr would weigh less than 4 lbs. Minishells would increase the 12 gauge count without adding weight. The shotgun, 1 adapter and ammo could be 10 lbs or slightly less. I have a takedown 20 gauge with 22lr, 9mm and 357 magnum adapters.
The idea is a survival gun that can shoot multiple different rounds in case you are scrounging ammo. The 22lr adapter makes the most sense as you can take small game and carry a lot of it. It allows the use of slugs for dangerous predators or larger animals. Takedown and folding shotguns are easier to store in an aircraft, ATV, snowmobile or in a backpack. 20 rounds of 12 gauge and 200 rounds of 22lr would weigh less than 4 lbs. Minishells would increase the 12 gauge count without adding weight. The shotgun, 1 adapter and ammo could be 10 lbs or slightly less. I have a takedown 20 gauge with 22lr, 9mm and 357 magnum adapters.