Rebarreled and since 1903's and most 1914's were only marked on the barrels that's the only info they have to go by if they don't know the guns.
Any one interested in a Springfield Model 83 clip fed pump? I don't understand the reason for rebarreling and not using a factory replacement - unless they no longer were available, but unmarked replacemnts should not have cost that much. The barrel would have needed to be turned and threaded and couldn't have been real cost effective considering effect on the value of the gun. PS this gun has a great bore.