Leupold Mark 4 Extended Range/Tactical Riflescope 8.5-

Xtended Twilight Lens System. With a front focal plane you can range at all magnifications and a lockable fast-focus eyepiece makes reticle focus simple to achieve and maintain while keeping the sight picture crisp and clear. Features positive tactile 1/10 milliradian click windage and elevation adjustments for fast and easy mil-based correction in the field. DiamondCoat 2 exterior lens coating. 2nd Generation Argon/Krypton Waterproofing. Generous eyebox. Blackened lens edges reduce unwanted glare and diffusion. Twin Bias Spring Erector System. 3:1 zoom ratio.