I want to change my 4”, non-pinned barrel on my model 64-3, to a 3” barrel for easier carry. Did they make a 3” version, and if so are barrels available? I already round-butted it from the factory square butt; so originality is not a concern. With gunsmithing prices and wait times for a full cut/regrown/dovetail for a front sight, and barrel polish, a simple screw-in swap seems the best route. Or is it?