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Looks squared still, info: https://www.smith-wesson.com/firearms/model-19-classic

John, looking at the back strap, the centered curve/slight hump in the middle is a "Squared" Butt. http://grips4guns.com/handgun_grips/Smith_Wesson_Revolver_Grips.html

All S&W K and L frame guns currently manufactured are ROUND BUTT. They may have square grips or round grips but if you remove the grips you will find a round frame.