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. Leupold Mark 4 LR/T Features Super Fast-Focus eyepiece Side focus Blackened lens edges Tactile Power Selector Twin Bias Spring Erector System Xtended Twilight Lens System Lockable Fast Focus Eyepiece Flip Back Lens Covers DiamondCoat 2 Lens Coating Blackened Lens Edges 6061-T6 Aircraft Quality Aluminum 100% Waterproof and Fogproof Leupold Mark 4 LR/T 3.5-10x40 IIlum Mil Dot Riflescope 67945