The Model 581 Distinguished Service Magnum is a blued L-Frame .357 Magnum revolver with fixed sights, designed to offer a middle ground between the K-Frame and the large N-Frame. The L-Frame cylinder is heavier than the K-Frame, better handling sustained .357 Magnum use. Type: Revolver Action: Double-Action Caliber: 357 Magnum Capacity: 6 Year introduced: 1981, USA Weight: 42 oz Overall length: 9.5" Status: Discontinued Intended use: Service / Law Enforcement