The Model 640 is a J-frame stainless .357 Magnum with a fully concealed internal hammer. The concealed hammer provides a completely snag-free draw from pocket or holster. Chambered in .357 Magnum rather than the standard .38 Special +P, the 640 provides maximum firepower in the compact J-frame platform at the cost of more significant recoil. Type: Revolver Action: Double-Action Caliber: .357 Magnum Capacity: 5 Year introduced: 1990, USA Weight: 23 oz Overall length: 6.6" Status: Active Intended use: concealed_carry, self_defense, law_enforcement