Buy a Hi-Viz sight they are nicer for the magnetic ones and come with 3-5 different colors and sizes of lite- pipes.
Or there is a new one on the market that I saw in one of the new mags, Gun Dog or Wildfowl I think, it is a longer style with 1 main green pipe and two minor red pipes. They claim if you are lined up and see the red pipes your eye is not in the correct spot for a proper sight plane.