Blackhawk with a convertible cylinder set in both .45 ACP (moon clips) and .45 Colt — a practical single-action that broadened the Blackhawk's ammunition flexibility. Type: Revolver Action: Single-Action Caliber: .45 ACP Capacity: 6 Year introduced: 1970, USA Weight: 40 oz Overall length: 13" Status: Active Intended use: Hunting, Collecting