CVA has a kit to convert your Northwest Breachplug black powder rifle to use 209 primers. This change is not permanent so if the need changes you can simple replace the removed parts and go back to Musket Caps.
Specifications and Features:
CVA 209 Conversion Kit AC1696
Quickly Convert to use 209 Primers
Can be converted back to Original configuration
Fits:
CVA Muzzleoaders with removable Northwest Breachplug (Musket Cap)