The Blackhawk Convertible includes both a .357 Magnum cylinder and a 9mm cylinder, allowing the revolver to fire either cartridge. The 9mm cylinder uses moon clips to headspace the rimless cartridge. Type: Revolver Action: Single-Action Caliber: .357 Magnum Capacity: 6 Year introduced: 1967, USA Weight: 42 oz Overall length: 10.5" Status: Active Intended use: Range, Collecting, Versatility