Perhaps I should have given more detail :oops: ;
The extra barrels are not currently contender barrels, but blanks and take-offs from other rifles.
My thinking was cut off the threads (if applicable) and turn barrel to correct diameter, rechamber, and TIG weld on the T/C lug.
In the end I have a Contender barrel for around $50 (Labor is cheap, I work for beer and band-aids) which is still $100+ cheaper than a used barrel.