From the get-go, the Redfield was a top-line scope. Redfield was also an important innovator. In 1962 it introduced the first-ever constantly-centered non-magnifying reticle. In 1966 came the Accu-Range rangefinder system (You think these things are new?) and the Marine Corps selected a special green-finish Redfield 3X-9X for use on its new M-40 sniper rifle. In 1968, Redfield introduced the Model 3200 target scope, which was the first high-magnification scope sight (16X, 20X, and 24X) with internal adjustments, which saved lots of weight and mechanical complications and allowed the scopes to be mounted low. This prompted me, and fools like me, to give up our wonderful Unertl scopes with external adjustments and return-to-battery springs.