High height Integral ring/base system accommodate 50mm objective scopes and under. Fits CVA Optima Elite Center-Fire Barrels, NEW CVA SCOUT Rifle (all Models) and all 2010 Model CVA Muzzleloaders (Wolf, Optima, Accura V20 Medium (Black). Our Z2 Alloy mounts provide features available on very high-end steel rings and bases. We're so confident in the durability of our scope mounts that they are Guaranteed for Life!