One of the most dependable, high-performance riflescopes on the market is Leupold's Mark 4 ER/T ("Extended Range/Tactical) series. Mark 4 scopes have an almost cult-like following within the tactical community; they are considered by many to represent the standard by which performance of other scope brands is measured.

Absolutely waterproof, featuring mil-based adjustments that complement mil-based reticles, superior clarity, a generous range of windage and elevation adjustments, this series of scopes is well-suited to tactical, competition, and hunting applications.