The Marble’s® Peep Tang Sight is one of the cornerstones of our line. In the days when iron sights were the rule and scopes were the exception, the Peep Tang Sight was considered the top of the line in both precision shooting and general hunting. The increase in speed is due to the way your vision is drawn through the rear sight. You don’t have to acquire a sight picture. You are looking through the rear sight not at the rear sight. Just put the front sight where you want to shoot and squeeze the trigger. It’s the fastest sight combination for Cowboy Action Shooters. Webster Marble advocated a tang mounted peep sight on every hunting gun and called the Peep Tang Sight "the perfect rear sight." Once you use one, you will agree.   The Marble’s® Peep Tang Sight is adjustable for windage and elevation. The adjustments are micrometer precise. Each firm detent click equals four-tenths of an inch movement at 100 yards. Each sight includes three apertures and mounting screws. Peep Tang Sight Specifications Peep Tang Sight Videos: • Sight Installation in Six Easy Steps • About Peep Tang Sights Mounting Instructions: • Marlin 39AS with serial number on tang • 1885 Browning with no tang • All other guns These instruction are in PDF format. Get the free reader by clicking on this link: