DEAD-ON One-Piece Ring-Base System – Low-Black. This innovative new design uses Z2 Alloy to makeit the strongest mount available for your CVA rifleand scope. The DEAD-ON one-piece system isthe fastest way to mount optics on your CVA rifleand will give you years of rock-solid performance.A one-piece system also means there are fewerparts that can come loose to affect your accuracy.Plus the molded Z2 Alloy ensures better ringalignment to grip your scope tighter but with lessstress on the scope tube.