TraditionsTM 1 - Pc. 209 Thunder Dome Breech Plug Install the Thunder Dome Breech plug and give your TraditionsTM in-line muzzleloader a super hot, reliable ignition. Works with both loose and pelletized powder. Back to top. CVA Replacement 209 Breech Plug For 209-capable CVA in-line rifles. Accepts standard 209 shotshell primers. Ideal for shooting Pyrodex pellets. Order ONLINE Today Back to top 4.5 (2) Buyer&39;s Club 17.99 Non-Member 19.99 Add to Cart.