The round-butt 4" Model 13 provided a more concealable grip frame profile on the standard service-length .357 Magnum K-Frame. Issued to agencies that preferred the round butt for concealed carry assignments with a service-length barrel. Type: Revolver Action: Double-Action Caliber: 357 Magnum Capacity: 6 Year introduced: 1974, USA Weight: 33.5 oz Overall length: 9.5" Status: Discontinued Intended use: Law Enforcement