I recently came up with a model 15-4 that has been customized into a ppc revolver. I would like to replace the blued fluted cylinder with a stainless unfluted cylinder. I would like to break up all the black with some two tone look. Where could I find a stainless unfluted cylinder for this model and would the new cylinder have to be fitted or timed by a gunsmith or could I just swap out the cylinders?