That is an Ulta-High Minuteman. Ultra high was a short-lived company back in the late seventies and early eighties that sold really low end guns, including a CVA "Kentucky Rifle" knock-off.
The Minuteman model does indeed have a two piece barrel. The joint, as you might expect, is where octagon and round meet. The brass bands were not part of the original kit, and may have been added in an attempt to dress the gun up a bit. Before posting this I tried to find an old post on another forum that had scans from and old Buckskin Report showing pictures of the sectioned barrel. I have that particular issue but no way to scan it.
New in kit form they sold for 50-75 bucks. The lock is pretty much junk and the two piece barrel would stop me from shooting anything but blanks. And light blanks at that.
I love flintlocks. I shoot them almost exclusively. A poor one - and the Minuteman (not to be confused with the old Numrich model of the same name) is a poor one, could very easily sour a person on flintlocks permanently. I wouldn't even want this particular gun for a wall hanger. Save your money and look for, at least, a used Italian rifle that is made 2000% better.