Something that will get you through anything and always be there to fire. Something you can always count on, no matter what. Cold, heat, wet, dirt, mud, drops, falls, bites, claws.
Is there anything in your mind, that you trust to take all that and keep on tickin’?
I don’t think I’ve ever heard of a Ruger No. 1 malfunctioning.
If you had to survive with one gun for the rest of your life, would you chose this?
Survive what? Survive where?
Survive when?
The year is 1997, you’re living in an alternate timeline where mars has been colonized for decades. You’re in Habitat 77, isolated from the rest of the habitats. G-raptors, genetically modified dinosaurs breed to survive on mars prowl the halls. What modern firearm do you choose?
Then no, not that single shot Ruger. I want a belt fed M60 machine gun with an ammo belt attachment.
Potentially anything, potentially anywhere.
I reject the premise of the question. Different situations call for drastically different equipment: