The North American Arms Mini-Master .22 WMR is a usa-made single-action revolver chambered in .22 WMR, introduced in 1990. Primary use: sport, hunting. Type: Revolver Action: Single-Action Caliber: .22 WMR Capacity: 8 Year introduced: 1990, USA Weight: 24 oz Overall length: 9" Status: Active Intended use: sport, hunting