Keith
If the huntsman is a SB1 the only barrels that you can get for that frame are ML and shotgun . The SB2 is required for all centerfire barrels .
Go to the FAQ's in the H&R centerfire forum and it will give you the info you need as far as which is which , sb1 or sb2 .
If it is a SB2 , then you can get ML , shotgun and centerfire barrels on that frame .
Richard