The Smith & Wesson 5904 9mm is a usa-made double-action pistol chambered in 9mm Luger, introduced in 1989. Primary use: self_defense, law_enforcement. Type: Pistol Action: Double-Action Caliber: 9mm Luger Capacity: 15 Year introduced: 1989, USA Weight: 24 oz Overall length: 7.4" Status: Discontinued Intended use: self_defense, law_enforcement