I bought two, now by three hm3x - Holosun HM3X 3x Red Dot Sight Magnifier

I match this magnifier up with the Holosun 510c. This way I have the benefit of the big window for Fast close distance shooting and then if I want to shoot at for the distance I just flipped the magnifier over. Even better if I decide that I don't want the extra weight on the rifle it comes off easily and goes back on easily with the quick release. I have a variable 1 to 8 scope on a dedicated distance shooter, the problem with that is that you're committed to a pound and a half of weight. No way to lighten that up.