Best of the best - Aimpoint Micro H-2 2 MOA Red Dot Sight

This is as good as it gets for 1X RDS. Light weight, small, durable, amazing battery life. Aimpoint has the best glass. If you have night vision get the T2 otherwise the H2 offers you more options in settings for non night vision use. The clear lens covers are great at protecting the glass and still allowing you to shoot. There are a ton of aftermarket mounts. I have tried and like Scalarworks, Larue, and ADM. It's expensive, but it's nice to be happy with something you spend your hard earned money on vs settling. If you can afford it, you should be very satisfied. I have an astigmatism and the dot isn't perfect for my eyes, but still very usable.