The heavy barrel Model 10 replaced the tapered barrel of earlier production with a full-weight round barrel profile, increasing mass for improved balance and reduced muzzle rise during rapid fire. The heavier profile became the standard K-frame configuration from the late 1950s onward. Type: Revolver Action: DA/SA Caliber: .38 Spl Capacity: 6 Year introduced: 1957, USA Weight: 33.5 oz Overall length: 9.2" Status: Active Intended use: Duty, Home Defense