Durasight Z2 Alloy Integral CVA and TC Inlines Medium Ring /Base Combo (Silver Finish) by CVA MUZZLELOADERS Our Z2 Alloy™ Series bases and rings are cast from a revolutionary new alloy that is 50% stronger than the aluminum used in conventional economy mounting systems – yet they are priced about the same. In our Z2 series you will find features previously only available on very high-end steel rings and bases. Features like solid and integral recoil lugs and Torx™ screw attachments and an opposing screw and clamp design. This system fits all CVA In-Lines and Traditions In-Lines and Winchester In-Lines and and T/C Encore and T/C Omega & T/C Triumph Muzzleloaders.