The Model 340M&P is built on a scandium alloy frame with a titanium cylinder and stainless steel barrel. At 11.4 ounces it is the lightest .357 Magnum revolver ever made, though recoil is described as violent. Type: Revolver Action: DAO Caliber: .357 Mag Capacity: 5 Year introduced: 2000, USA Weight: 11.4 oz Overall length: 6.3" Status: Active Intended use: Carry, Backup