Ive had only a few problems, none with guns but with stocks/accessories.
Both times I explained that it was their mistake, and I EXPECT them to send me the return label.
Politely I may add.
Both times I got the label, and it worked out fine.
If the origional barrel is bad, ie a bad dovetail, they should fix it, and I would hope they pay shipping, but Ive had to send in guns for repair to other companies and they refused to pay return shipping for warranty work, I dont buy from them anymore.
Good luck
Dave