The NcStar 30mm Red & Green Dot Tube Optic is an excellent entry level option for those who want add an optic that won't take up too much of your top rail and allows the operator to co-witness with their iron sights.
The LED reticle is housed in a Black Anodized Aluminum Body. The Rheostat Knob has 5 brightness settings for both the red and green reticle to optimize usability.
Package includes 30mm Cantilever weaver/picatinny type mount.
Powered by included 3 volt Lithium Batteries (CR2032).
Comes with extra battery and mounting hardware.
Download the product manual here.