You may be jumping the gun with the comment "a generic barrel instead".... I think some of you are missing the point. The OP payed for a specific high end barrel and the builder used a generic barrel instead, that IS a disaster. It's not like the builder can say "oh sorry, I'll just swap you barrels".
Rice makes barrels with square cut rifling as well as round cut rifling. It is very possible that the barrel used to build this rifle is a high end Rice barrel and the builder overlooked the fact that the rifling is square cut.