Interesting thread, good topic. Survival guns...a complicated issue in a way. If I am in a survival situation my "survival gun" will simply be whatever one I have on me. Generally that's an HK USPf9 or an HK P30S. Sometimes I'm carrying both of them (one on my hip and the other in Hill People Gear Kit Bag). If I'm hunting get lost then I'll be carrying a hunting gun, whatever that is. That last one is theoretical though since I haven't hunted in many years.

Many folks live in places where every firearm I own would be prohibited. In stock form only my .22 pistol would pass muster in CA, and it would be illegal in NY.

The new-ish Ruger 10/22 Takedown model would be a pretty good survival gun. Not ideal for larger game but it would work.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman