Jack.. fair assumption.. but.. they might have been a .030/.045 set.. Which I would LOVE to own.. The .045 bottom might have been to tight for some shooters..so they opened the chokes up..and the bore left unmolested..
The seller should put the bore sizes down..it would help them sell.. I'd bet the bores are virgin but the bottom barrel has been opened up.. If I were staying in town.. I'd probably be after these.. The rest of the specs will tell what exactly these barrels are.. Seems very interesting.. Maybe the seller will post top and bottom bore size..
All Good.. Mike