Leupold FX-3 6x42mm Riflescope, Wide Duplex Reticle, Matte Black 1/4 MOA precision finger click adjustments for windage and elevation offer absolute repeatability and dependability over a lifetime of extreme use Durable and compact, the one-inch maintube is lightweight and fits more legacy rings Absolute waterproof and fogproof integrity  each is ready for a lifetime in the field, in all conditions Features proprietary Argon/Krypton gas blend, which nearly eliminates the effects of thermal shock, and reduces the diffusion of gases sealed inside your scope even more than Leupold's proven nitrogen technology already does Blackened lens edges reduce light diffusion, so more usable light reaches the shooter's eye. This results in a brighter image with increased contrast