I did it several years ago.I bought a cheap .270 short chambered barrel from Gun Parts.I had access to a shop then. I tapered it, threaded it and then had a smith finish. the chamber.

Not hard, but as noted the safety is not all that nice.I hear one can buy a refit now though.

If God wanted you to walk and carry things on your back, He would not have invented stirrups and pack saddles