The Model 37 Airweight is an aluminum-alloy-framed version of the Model 36, reducing weight to approximately 13.5 ounces unloaded. The alloy frame makes it one of the lightest steel-cylinder .38 Special revolvers ever produced. It became a staple backup and off-duty gun for American police. Type: Revolver Action: Double-Action Caliber: .38 Special Capacity: 5 Year introduced: 1952, USA Weight: 13.5 oz Overall length: 6.31" Status: Discontinued Intended use: concealed_carry, backup, off-duty