Welcome to the forum Pacsd. You'll get all the info you need here. Did you get any thing at all along with the gun, or just the gun?

I have to admit the Markesbery is a new one on me. GOOGLED "markesbery muzzleloaders" and found a bit of info about them (well made with Green Mountain barrels - 1:26" twist seems to be the norm).

But I couldn't find a picture of one. I'd really like to see some pictures, especially some close-ups of the breech area.