I guess when I think survival gun I think hunting, but more importantly I think how fast can you pull it from your BOB and defend yourself, doesnt set up take 5 min. or so?
No. It only takes seconds to assemble in the field. I love mine, and it's really quiet for some reason. A 5 year old could put it together.
Another option to consider is the Marlin papoose. I have one and am very pleased with it. It has a slightly larger form factor but it is quite sturdy and surprisingly accurate.