There are many things you look for in a "survival" or "backpack" gun: Ease of portability, ease of obtaining ammunition, ease of use and reliability. Additionally, it would be great if the gun didn't break the bank. If our article about how to build the perfect bug-out bag got you thinking about whether the Kel-Tec Sub-2000 pistol-caliber carbine might be the backpack gun for you, you'll enjoy this video review from American Rifleman's Kelly Young.