The NCStar Red Dot Sight increases your accuracy, response time and intuitive shooting. The red dot's design incorporates technology use by military units worldwide on land, sea and even in the air. This sighting mechanism will allow you to keep both eyes open and will see true independent of your head position or head movement. This scope has many of the tried and true design innovations of classic reflex sights, but engineered to a present day level of precision with the best materials. This sight is manufactured with lightweight polymer for resilience in the most rugged conditions and is made to last a lifetime.