What is the muzzle diameter? Personally, I would go with the biggest diameter thread that leaves say a 1mm shoulder for the supressor to pull up to. Maybe a 14mm x 1mm if the muzzle is about 16mm. 1/2" unf seems to be the popular fall back though. Also, if you may possibly use the supressor on another rifle, think about that as well.
For example, my blaser barrels are all 15x1 thread so I can use the same supressor or brake on all barrels if I want
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