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I have the RMR05G, which is the dual illuminated green dot. I also have the RMR06 Type 2, which has an adjustable 3.5 MOA dot. When I first decided to put an RMR on a pistol I got the dual illuminated model for two reasons. First, it was cheaper than the LED versions. Second, the LED versions used have reports of flickering dots during recoil. There are fixes for the flickering if you are interested in one of the Type 1s which are now much cheaper. With the Type 2s, the issue has been resolved.

I decided to get the adjustable type 2 LED version after experimenting with the dual illuminated due to the draw backs of the dual illuminated models. With the dual illuminated, there is a tendency for the dot to become washed out and unable to be seen. This is really only a problem when you are aiming at an area that is more well lit than the area you are standing (ex. using a weapon mounted light, standing in a dark room or hallway and aiming into a more well lit room, occupying a dark house and aiming towards an outside window or doorway, etc.). For range use, that's not a problem, but it is undesirable for defensive use when you don't get to pick the time and/or environment in which you have to use it.