CVA Durasight Z2 Alloy Dead-On Base/Ring System Medium Black. These Riflescope Rings designed by CVA Brand are a one-piece system for increased durability and stability when firing your rifle. The materials used in this CVA Durasight Z2 Integral Ring and Base Mount allow for better ring alignment while gripping your scope tighter without putting much stress on your scope's tube. Enhance your optical setup by mounting your glass with this CVA Durasight Z2 Alloy Dead-On Base/Ring System. Specifications for CVA Durasight Z2 Alloy Dead-On Base/Ring System Medium Black: Manufacturer: CVA Finish: Black Condition: New Color: Black Features of CVA Durasight Z2 Alloy Dead-On Base/Ring System AVC-MT-DS411B Medium height ring/base accommodate 40mm objective scopes and under DEAD-ON one-piece system Fits CVA Apex Optima Elite Center-Fire Barrels NEW CVA SCOUT Rifle (all Models) and all 2010 or later Model CVA Muzzleloaders (Wolf Optima Accura V20 Medium (Black) Package Contents: CVA Durasight Z2 Alloy Dead-On Base/Ring System Medium Black AVC-MT-DS411B