It is a CVA Optima. Older not Optima 2. It has a button in front of trigger guard to open breech. Breech plug is in correctly. It has the quick detachable plug. I cleaned it and plug back in with their plug greaseIs it a CVA?
Check to make sure the breech plug is tight and then check the primer pocket to ensure the primer is seated. If it’s dirty, clean it out or if clean check for burrs and such.
Some folks have had issues with the Blackhorn 209 breech plugs.