The U.S. military asked for a scope that is exceptionally fast and applicable to a wide range of targets at various distances. The 3.5-15 x 50 F1 NXS is the answer. The reticle is located in the first focal plane, which has distinct advantages in high-stress situations and when the user might encounter targets from up-close to 1000 yards or more. A first focal plane reticle remains in the same visual proportion to the target across the scope’s entire magnification range, making it especially appropriate with rangefinding reticles. Combined with Nightforce highly tactile and intuitive adjustments, it makes for a scope that is extremely quick, accurate, responsive and utterly reliable.
Big Book Catalog, Issue:67, Page:279
Sinclair, Issue:4A, Page:184