Rossi uses two different receiver sizes that I know of. The one that compares in size to our SB1 or SB2, and a smaller one. I bought my grandchildren a combo Rossi 410-22, and the receiver is MUCH smaller, and I would not think there would be any chance of using one of those barrels. If I thought there were, I would buy another combo, as it can be had for about $120.00 with both barrels.
Perhaps they make a larger one? Beats me, but be careful as you order. It would have to have an offset bore I'm thinking, as the Versa barrel for the HR is.
Ben