One of the best choices, is the North American Arms Black Widow. This is a single action 5-shot mini-revolver with a 2" heavy barrel and suprisingly comfortable rubber grips. It is made of stainless steel and chambered for the .22 WMR (Magnum) cartridge. An extra cylinder for .22 LR is also available. It is a very small gun, weighing about 9 ounces.