Premium Vortex Strikefire II Optic. 30mm Red/Green Dot provides splitsecond target acquisition and maximum field of view with both eyes open. Cantilever mount is ideal for AR platforms, positioning the optic bore center 40mm above the top rail, allowing for the addition of iron rifle sights. Sleek rear-facing controls provide easy adjustment of 10 dot intensity levels. Rugged aluminum alloy chassis provides an extra-high recoil rating and is both waterproof and fogproof.