The Primary Arms AR Absolute Cowitness 30MM Red Dot Mount locates your red dot scope or magnifier with a 30mm mounting tube at the absolute cowitness height. When looking down the iron sights, the red dot will be placed in the middle of the red dot's scope tube. The AR Absolute Cowitness Red Dot mount features a light weight design, anodized aluminum construction, and is easy to install.FeaturesCowitness height Lightweight and durable designEasy to install