The Smith & Wesson Model 18 is a usa-made double-action revolver chambered in .22 LR, introduced in 1949. Primary use: self_defense, law_enforcement. Type: Revolver Action: Double-Action Caliber: .22 LR Capacity: 8 Year introduced: 1949, USA Weight: 24 oz Overall length: 9" Status: Discontinued Intended use: self_defense, law_enforcement