TOW would not tell me who the maker is as the exterior is not well finished [milling marks] and they did not want there name mentioned,only that they are well established and known for quality barrels. I have built many rifles with the following barrels,H&H, Getz, GRRW, Sharron, Douglas,Rice and Green Mountain and have never seen a muzzleloader barrel rifled like this one, therefor my concern.