The Smith & Wesson Model 66 Combat Magnum is a stainless steel version of the blued Model 19, offering the same K-frame ergonomics in a more rust-resistant package. It was widely adopted by US Marshals, FBI agents, and law enforcement agencies that preferred stainless over blued. The Model 66 is the definitive K-frame .357 Magnum stainless revolver — combining the handling of the classic Combat Magnum with practical durability for field use. Type: Revolver Action: Double-Action Caliber: 357 Magnum Capacity: 6 Year introduced: 1970, USA Weight: 36.5 oz Overall length: 9.5" Status: Discontinued Intended use: military, law_enforcement, collector