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. It’s the fastest sight combination for Cowboy Action Shooters. The Marble’s® Peep Tang Sight is adjustable for windage and elevation. Each firm detent click equals four-tenths of an inch movement at 100 yards. Each sight includes three apertures and mounting screws.