The Blackhawk Convertible comes with two cylinders — one chambered for .45 Colt and one for .45 ACP. The rimless .45 ACP uses full-moon clips to headspace in the cylinder. This gives the shooter access to both cartridges with a single firearm and allows the use of the widely available and often less expensive .45 ACP ammunition for practice. Swapping cylinders takes under a minute. Type: Revolver Action: Single-Action Caliber: .45 Colt Capacity: 6 Year introduced: 1971, USA Weight: 42 oz Overall length: 11.25" Status: Active Intended use: sporting, cowboy_action, collecting