Abstract: A double action hammer for a revolver including a link pivotably mounted off center in a groove in the top of the hammer so that when pivoted from the groove to an exterior position relative to the groove it will be locked in place and will move the hammer to cock the trigger of the revolver for quick action. A leaf spring is embedded in the hammer between a wall of the groove and the bottom of the link to aid in pivoting the link to a closed position. In its closed position in the groove, the link has an outer surface contiguous with the outer edge of the hammer so that when the revolver is placed in a pocket, it will not snag on the clothes of the user enabling ready removal of the revolver.