I have two one is an Endeavor which is the same with a recoil system added and one I bought the parts for and put together with a Bergara 45 caliber barrel. With a minor bit of tuning and Bellm #3 trigger kit they are special the best of the change barrel guns.
Potential : you can pick up a pistol barrel and stock for it or any of the common deer rifle calibers and change over in 10 minutes once you are used to doing it. I have had most of the common muzzleloaders and prefer the Encore. If you get it and intend to use it and have any questions PM me.