These replacement breech plugs are the same reliable design and quality that come standard with all CVA rifles. Specifications and Features:Stainless steelFor 209 shotgun primer ignitionFits: Pivot action and break action CVA rifles made in 2009 and before including Optima, Optima Pro, Wolf, Kodiac and Kodiac ProThe last two numbers of your serial number indicate the year your model was made. Example 61-13-??????-01 this model was made in 2001.