The American Defense Etech-R Quick-Detachable Picatinny-Style Riser is just what you need to mount your EOTech sight to your flattop AR-15. This riser will raise the height of your EOTech by 0.25"to allow for proper eye alignment with the sight. There is also a small section of rail that allows for the mounting of a magnifier or night vision device. The Etech-R is constructed of 6061 T6 aluminum.