Hi Lefty,
As Mark King said, all thats required may be a new barrel. I am not aware of a company doing it but I know of a Gunsmith who may be able to help you out.
His name is Van Schneider and his email is:
gunworkscustom@aol.com
Telephone # is: (419)626-3034
Talk to him he should be able to help you out.
Regards,
Anand.