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One can purchase a CVA muzzleloader from the official website of CVA. These hunting equipment costs between 100-600 dollars and comes in numerous specifications.
1:28
You need to seek the services of a good gunsmith.
Around $250 to $450 dollars, depending on where you shop. This website has all the CVA Optima V2 rifles in stock www.muzzle-loaders.com
It's on the barrel under the forend. You'll have to remove the forend.
Cabela's or Dixie Gun Works would be your best bet, or gunborker website.
"Best" is a subjective term that depends, among other things, on your skills, intended use, pocketbook, "feel" of the weapon, etc..
A CVA Revolver with the serial number b52937 could be worth anything. But with your discription it is hard to put a price on it. How much it is worth depends on the condition it is in. It could range from nothing to a couple thousand.
50-500
50-350
50-200
50-275 usd