A Hold-Out Pistol is an extremely small pistol designed to be secreted in a pocket, hidden holster, or other place of concealment. Hold-out pistols are kept as backup weapons in case a character loses their primary weapon(s), or by characters who desire not to be seen obviously armed, but for whatever reason do not wish to attempt to conceal a full-size pistol. They are approximately the size of a human palm, which is why they are sometimes referred to as "palm pistols".
As a result of their small size, hold-out pistols have limited range compared to full-size pistols as well as limited ammunition capacity. They do, however, do similar damage.
Many jurisdictions heavily regulate or outright ban the possession and use of hold-out pistols.
This item by ChrisDonovan