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If you buy a blue Python and say you gotta great deal on a 4" but don't like the 4" you may want to hold on to the barrel to have it changed to a 6". Personally, I don't think you will ever need those parts on another gun unless you buy one damaged. You may be able to use the cylinder and ejector to I'd timing on a bad revolver but the internal parts have been stoned and may not fit any other gun. Main spring is always good to have extra.