The Colt Diamondback in .38 Special with 2.5-inch barrel, the most compact Diamondback configuration for plainclothes carry while retaining the Python-cosmetic vent rib barrel. Type: Revolver Action: Double-Action Caliber: .38 Special Capacity: 6 Year introduced: 1966, USA Weight: 26.5 oz Overall length: 7.4" Status: Discontinued Intended use: Law Enforcement, Concealed Carry, Collecting