Ah, yes, threading SAR-1 barrels. I remember doing two of those years ago after the AWB of '94 expired. There were people on here renting out threading kits that were passed around from member to member. One guy used it, then he dropped it in the mail to the next guy on the list. It was super easy to do and I had my two rifles done in about 20 minutes or so.
Good luck in whatever you end up doing.