I have a blued Model 27-2, serial # N1779XX. The barrel and cylinder have a very slight reddish tint that is different than the frame, not noticeable unless you really look at the gun under good light. I don't believe the gun has been re-blued. Has anyone experienced this with a factory finish? I was told that S&W blued the pistol parts in different lots and then assembled the guns. The gun is in pristine condition, I can't believe the factory would release a gun this way. Any thoughts?