Bingo
Ya it should go back to the factory , I would call them first though , with the plant move it may be some time before you get the rifle back , maybe months .
If your the do it yourself type check the FAQs for barrel fitting , it may be a simple fix that you can do .
Not sure that H&R ever made a 243 / 50 ML combo so this could be a case of someone buying a 2nd hand barrel for the ML and it may not be the proper frame for the 243 .
stimpy