I have owned the Leupold Mark 4 PR 4.5-14x40, as well as the Nightforce NXS models 3.5-15x50, and 5.5-22x50. For the price the Mark 4 PR is a great scope and you would not be disappointed. However the Nightforce NXS scopes are heavier built, feel bomb proof, and are slightly brighter. If you're trying to save a few bucks on a high end tactical scope go with the Mark 4 PR (Precision Rifle), however if you want close to Schmidt & Bender like quality in a bomb proof, simple to use, military grade scope, then buy the Nightforce. IMHO.