Leupold has expanded its Mark 4 Mounting System line to include the new Leupold Mark 4 High 30 mm Rings, which will allow even more scopes to be mounted with this tactical mounting system. The new rings are built to the same specifications as the rest of the Mark 4 Mounting System line. Each solid steel Mark 4 base and ring meets and often exceeds the most rigorous military specification for bases and rings. With this expansion of the Mark 4 line of rings, there is now a Mark 4 Ring for nearly every scope.