I don't think there is any such thing as a "survival guns" any more than I think there are "Evil Guns”, "Righteous Guns", "Communist Guns" or "Gangster Guns"

There are guns used by survivors of bad situations. But the gun is the smallest part of the equation. The person and his or her mind set and skill are the 2 things that matter.

“Survival” is too broad a term. What does it mean? It means staying alive.
However it doesn’t mean any specific dangerous situation.

If you survive the impact of a plane crash in on top of the Andes you will need to do a lot of things different than if you survive a plane crash in North Korea.
In both these situations you need help from friends far more than you need any gun.

To survive in the Rocky Mountains with a broken foot for 2 weeks until you are found, you’d want a different kind of rifle than you would if you were trapped in LA California for 2 weeks during a total civil melt down, or along the Arizona border during an invasion by 100 Illegal aliens who want to take your home your food and your life.

To my way of thinking there are really only 2 applications for firearms in “survival situations”
#1 is hunting ( but hunting what?)
#2 is fighting. ( but fighting who or what?)

It’s an interesting subject to compare the attributes of different arms which may cover the bases of both #1 and #2.

But I think we should leave the title “survival gun” behind. It’s not really a valid moniker.