wheelgun,
A new barrel from CVA will cost you about $90, but it will be 1/48 twist. A drop in barrel for it will probably require that you install a new tang and fit it all to your current lock. I jst finished one and it really isn't to much work.
CVA's came with either a button hook or a tang hook, you will have to know which one you have. Purchasing a new tang is no problem but it may have to inletted into the stock.
Good luck