With the highest magnification level of the sporting fixed power scopes, the FX-3 12x40mm Adj. Obj. Target Scope with the Leupold Dot reticle, part# 66840, offers higher magnification and adjustable objective. The 40mm objective is still small enough to mount close to the rifle while not overly restricting the amount of light entering the system. The FX-3 12x40 Target Scope is made for those hunters and shooters who appreciate the traditional form and function of a fixed power riflescope ideal for hunting in the open country.