If it is a Master hunter barrel (they did put together parts rifles with master hunter barrels) the serial number will probably have MHDE in it somewhere. Mine is just such a parts rifle and that's what mine says. It's the most accuarate muzzleloader I have fired, and it's a .45 to boot. I once missed a deer and told my father that the gun must be off. He set up a target at 100 yards and told me to check it. I fired and he walked down and looked at the target, he came back and said well the guns fine, but obviously you weren't because it was dead center in the bullseye. I've come to realize with that gun, that on the rare occasion I miss, it was me.