As I wrote above, your Lorenz rifle was exported from Austria to the Confederacy during the Civil War. Since the war did not start until 1861, it must therefore have been floating around somewhere in an Austrian arsenal awaiting distribution somewhere. Along come representatives from the Confederate States of America with good American gold dollars and the deal is done. It was not made for export - none of them were - but money, especially gold, has its own vocabulary.
And BTW, It is no use measuring a metric barrel and thinking in English measurements. It was made, as ALL European military arms were/are, in metric dimensions. The Lorenz rifle musket had some pretty loose acceptance dimensions that would have been laughed at by the British and American gun makers of the day. The bore was acceptable between 13.8 and 14.5mm..........precision it wasn't. That barrel you showed us would have been scrap iron in Enfield or Springfield. Appalling craftsmanship TBH.