Pistol Pacs ended up selected by a “P” then the model variety of the revolver frame, then the barrel shroud sort (blank) for standard, “V” for vent, “VH” for Vent HeavyInteresting notion, I maye have to check out it sooner or later. Just comparing The 2 guns facet by facet, it appears like the .357 barrel from the Model 15 is larger siz