Firstly, and I know I'm going to get it from the AK followers, but I hate the AK-47. I repeat, hate it. It's a commie gun, the gun of our enemies and I have been shot at too many times from some dueche bag using one that I will never willingly use one unless absolutely necessary. But I digress.... I have often thought of this question and I always keep coming back to the .22. Specifically, the 10/22. Tons of options out there for mods, rounds are light so you can carry tons, 90% of the game out there you could take down, and self-defense. People talk about stopping power, but dead is dead. It don't matter if it's from a .22 or a .45ACP. Now, if you needed to crack an engine block then I agree, but in survival mode, I'm looking to keep my family safe, defend myself, and provide for my family.

However, the AR is a very close second with all the availability of rounds, replacement parts and such. But like some on this forum, I don't plan on having conact with too many people I don't know, and will avoid confrontation if possible.