I'm into a project that relates to this thread.
Earlier in the thread, the use of pellet guns as a stock pot filler came up. While there is no "perfect one rifle", the airgun has some advantages. Big one being that you can have a pellet gun in the woods where and when a real firearm would be a crime. Real likely survival scenario being 'lost or hurt in the woods', not as exciting as TEOTWAWKI but WAY more likely. Being stuck out for a day or two would go better with a belly full of tweety bird than a belly full of nothing. On the same train of thought, an airgun doesn't require the same paperworkand hassles of a silenced 22, likewise no barrel length issues.
This is where my project comes up. I promised to get to it eventually, and here we are.
I'm making an adapter to put a folding stock (made for the Tipman 98 paintball gun) onto a Crosman 1377 "American Classic" air pistol. They are kind of big as pistols go, but they are also pretty powerful pellet guns. There are tons of modifications and custom tricks you can do on the Crosman guns for power, accuracy or just for personal taste. There is a guy who makes a similar adapter
http://muzzlemack.com/13xxItems.aspx Mine will be different but this gives you an idea of what I'm doing. His is straight from the back, mine has an offset so I can use the original sights better.
The idea of the end goal is a pellet gun that can fold up and go into a backpack, even a small daypack. That way it can go out for a day hike. Maybe do a little plinking, which would be a HUGE no-no with a (GASP!) real gun around here. If I find myself with a broken leg waiting a day or more for someone to come get me out of there, I can eat squirrels and birds. Even if I don't need it, it's still a fun thing.
Beeman used to make a pistol with an MP-40 like fold under stock. This got my mind working when I ran across it in a book. It just makes great sense. Small enough to take with you, accurate and powerful enough for small critters up close, and legaly inocuous. It's not a SBR with a silencer, it's a pellet gun. Great thing about pellet guns, they are generaly not a problem unless you use them in an illegal way. Guns should be that way too, but that's just not the way it is today.
Anyway, sorry if this is dragging up a dead horse and kicking it again, but while I was working on this thread popped to mind. While far from an ideal survival rifle, a compact pellet gun with a stock could be a great thing to have around. Any good pellet pistol could get a shoulder stock on it. When I'm done with this I may well do it with a better quality gun. As is I'm going to be into this project for near but less than a hundred bucks. That's not bad for a fishing, hiking plinker.