Runner Up: DoubleTap Aluminum Handgun
This tactical gun may not look like much, but it works well for its very specific purposes: hiding in plain sight and shooting targets up to 10 feet away. When the SHTF, this is going to be a gun that you will want to have in your arsenal because it is practically unnoticeable in your pocket.
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This is due to an extremely thin body that is only about the width of a finger, combined with a height of 3.9 inches and a length of 5.5 inches. The DoupleTap handgun weighs a mere 15 ounces, and it is easy to retrieve from your pocket. It is picky about bullets, so make sure you test it out before you find yourself in a life or death situation.