209 Hex Head Shotgun Primer Replacement Breech Plug. Replacement breech plugs are the same reliable designs and quality that come standard with all CVA rifles. This Breech plug is only for Pivot-Action and Break-Actions made in *2009 and before these models would include- Optima-Optima Pro-Wolf-Kodiak-Kodiak Pro. The last to numbers of your serial number indicate the year your model was made