s&w 617 also known as the K-Frame revolver, is among the most important innovations in the history of smith and wesson. The parts of this K-Frame revolver can be dismantled. This revolver was built specifically to handle the .38 smith&wesson special cartridge. The K-Frame revolver since its production has been the favorite selection for military and police professionals, target shooters, and enthusiasts. Model 617 is available .38 S&W Special and in .22 LR, .357 Magnum.