DEAD-ON One-Piece Ring-Base System - Low-Black. This innovative new design uses Z2 Alloy to make it the strongest mount available for your CVA rifle and scope. The DEAD-ON one-piece system is the fastest way to mount optics on your CVA rifle and will give you years of rock-solid performance. A one-piece system also means there are fewer parts that can come loose to affect your accuracy. Plus the molded Z2 Alloy ensures better ring alignment to grip your scope tighter but with less stress on the scope tube.