Meet the DoubleTap. This little .45 caliber pistol from Heizer Defense has the distinction of being the world’s smallest .45. It measures 5.5″ long, 3.9″ tall and tips the scales at 12 or 14 ounces depending on whether you get it in aluminum or titanium — like there is any choice. The gun holds two bullets in its over-and-under barrels and holds another two in the handle.
Price: $500 for aluminum, $700 for titanium.
For a much smaller and less dangerous firearm, check out the Swiss Minigun.