Hi
The percussion rifle is a CVA, or Connecticut valley arms, it was made in Spain, and was sold as kits or you could get one fully assembled.
It is a .45 caliber barrel.
I don't know about the other one, but I do know that you cannot remove what would normally be the breach plug on the CVA gun, it is welded on. I still have two of these, one is percussion, the other is flint, the percussion gun works fine is is a good gun for a beginner, as the can still be found cheaply, the flint was very accurate WHEN it sparked, I had the frizzen hardened many times, but it was still lousy steel and would not hold hardness for long.
Hope this helps you out.