There is probably only one survival tool that surpasses the firearm in usefulness and that is the knife. If the survivalist can take only a single tool, a good sturdy knife should be on the short list. Aside from the direct application of a knife’s usefulness in regards to cutting, trimming, slicing, hammering and hacking – a knife can also be used to construct other tools.
A knife requires no fuel or other consumable resource to operate, giving it a distinct advantage over the firearm in terms of long term usefulness. Every survivalist must absolutely own at least one fine blade that they can rely on when their life depends on it!