Model 1 in 9mm — stainless over-under derringer with moon-clip headspacing for the rimless 9mm cartridge. One of the more practical American Derringer calibers for urban carry. Type: Derringer Action: Break-Action Caliber: 9mm Capacity: 2 Year introduced: 1980, USA Weight: 15 oz Overall length: 4.82" Status: Active Intended use: concealed carry, backup