Some of the "early" Japanese muzzleloaders are suitable for wall hangers or stage props only. I have one, a vestigially accurate copy of a Tower type pistol in .69 cal. It is so overbuilt that it is safe to shoot as as the bore diameter and length don't allow pressures to build very far. The lock is crude and is a real rock crusher, but generates enough fire to cook over, lock time is measured in minutes. I have taken several blue grouse, what we (I) in W. Wash. call Fool Hens, with it over the years, using it like a short barreled shotgun with 25 gr. FFF under 5/8 oz of #4 shot, but other than that it hangs on my fireplace as a curio. It was a birthday gift from my Mom many years ago. To the best of my knowledge she paid less than $20 for it as a kit at the Western Auto store in Hot Springs SD. About what it was and is worth. I've seen two Ultra-Hi long guns that had two piece barrels, apparently sil-brazed together at about mid length. One was a Brown Bess replica and the other was a "Kentucky" type interpretation that had the rifling mismatched about halfway down the bore as though the barrel had been assembled from salvaged bits. It also had a chrome plated brass trigger and sear. If I encountered another, I think I'd plug the touch hole or have a slug welded into the muzzle, both if I could.
If memory serves Ultra-Hi evaporated into the ether many years ago.
Three Hawks