I am currently using a Leupold M8 2.5X Compact on my 1895G Guide Gun. It is phenominal, and perfect for the gun and caliber. I would highly suggest taking a hard look at the 1-4X or the 2.5X Leupolds with the 20mm objectives. Contrary to popular belief, the 20mm objective gathers a whole lot of light, primarily from the comparitavely low power and good glass that Leupold uses. Don't skimp on the mounts. Warne, Talley, and Leupold are the best IMHO.