New in box, Aimpoint ACO. Will come with mount pictured. Developed with the up to date sporting rifle owner in mind, the ACO is able to mount and shoot right away out of the box. A 30mm aluminum alloy sight tube is paired with a rugged fixed height mount designed to supply absolute co-witness with gun backup iron sights. The ACO utilizes a two Minute of Angle(2 MOA) red dot to permit maximum target acquisition speed and accuracy at all distances. Aimpoint exclusive ACET technology allows for as much as one year of continuing-on use from a single DL1/3N battery. With a fully water-resistant housing, the sight can be utilized in almost all environmental conditions.