There was a barrel accessory plan in planing for Rossi for a couple years, but it seems they have parted with the idea. A shame really, as they have good potiential. One of the main problems I keep observing is they most likely need a good barrel scrub with Flitz(or the like) to smooth them out. Though I haven't owned one so I can't say, could be a number of problems for the non shooters...anyway...If you could locate a used barrel for sale and wanted to try your luck then the FAQs over in the NEF/H&R centerfire forum would be most helpful as they are close in design. Though I have heard there are different reciever hardness much like NEF/H&Rs. Some more capable to handling the high pressures of centerfire cartridges. Still this is just rumor to me, I would call the company on that one.
-Aaron