Which? Pretty much any .22 can serve as an effective survival gun, but we happen to like the Marlin Golden 39A (above). It is a lever-action rifle that will feed shorts(26), longs(21) or LR(19) cartridges through its tubular magazine without a fuss, unlike some semi-autos, which can be picky about their diet. The take-down screw on the side of the receiver breaks the rifle apart for easy transport. The frame is tapped for mounting a scope, but the buckhorn iron sights that come with the rifle work well too. ($645; marlinfirearms.com)
How? Should you need to use a .22 to take down a larger animal, such as a deer or elk, aim for the base of the skull right below the ear. With a standard 40-grain lead bullet traveling at 1,100 fps, the animal will drop as if it had been hit by a locomotive if your aim is true.