Aim Sports J3HD31232A: The Aimsports Scout offers a long eye relief scope that compensates for parallax. With the greater operating distances of our 3-12x model, this feature sets us apart from the crowd. These scopes are meant to be mounted forward of the rifle action, or on top of a pistol slide, or revolver frame. The scope is nitrogen charged, sealed, fog proof and shock-resistant. Capped, finger adjustable windage and elevation knobs and AO-Adjustable Objective lens system for parallax fine tuning.