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What exactly are you trying to achieve with threading?... threading what?
If you are thinking choke tubes, there is more than just threading involved. You will have to find someone with the tooling for 10 gauge and the choke tubes...
The best place for this kind of work is Briley. They can do the work and supply any choke you want.
My hunting buddy just had a Browning Auto 5 barrel back bored and threaded for removable choke tubes for steel shot.
They do beautiful work but you have to tell them exactly what you want.
BB
It is not such a simple job, judging from the number of responses you should
understand that not many can do this work in Canada, not properly anyway.
BB