I have used a Simmons 4 recticle red dot scope on a 4" S&W 686, 5" S&W 627, 4" S&W 329, 6-1/2" S&W 629, Marlin 1894C, Marlin 1894SS without problems. The Simmons has held up well with recoil. If it is asthetics you are asking about, beauty is in the eye of the beholder. For my use it is simply a matter of vision. The 4" revolver got me better results with the red dot than manual sights. The looks did not bother me. If it is for hunting and using a 4" revolver does not bother you, why would a red dot scope on it matter?