The Leupold Mark 4 LR/T ("Long Range/Tactical") is precision engineered and built to meet the needs of professional shooters throughout the world. In fact, there are currently more Mark 4 LR/T scopes in service with the US military than any other brand. Incredibly rugged, absolutely waterproof, and totally accurate, the Mark 4 LR/T is a proven scope. They are everything a tactical shooter, long-range shooter, target shooter, or hunter could ask for.