*Shockproof and water resistant, the gun sight can hold the recoil and keep zero well*Loop-top prevents the lid of the dot sight windage/elevation adjustment would not be lost*Come with cantilever mount which fits for 20 mm rail, the sight is easy to installCvlife Red & Green dot sight is made of aviation-grade aluminum alloy, which allows the red dot sight to keep zero well. Red and green dot and 5-level brightness adjustment can adapt to various light intensities.