The Cimarron Firearms 1890 Police is a usa-made single-action revolver chambered in 45 Colt, introduced in 1990. Primary use: Cowboy Action, Collecting. Type: Revolver Action: Single-Action Caliber: 45 Colt Capacity: 6 Year introduced: 1990, USA Weight: 37 oz Overall length: 10.75" Status: Active Intended use: Cowboy Action, Collecting