I've had good service from Roger Spackman at Sub-Silent Suppressors.
He has a dedicated lathe he uses just for threading barrels.
As a bonus, he is Auckland based. Might be worth talking to him about suppressors while you are at it.
Sub-Silent Suppressors | custom rimfire, centerfire, CO2 and PCP silencers, suppressors and moderators. Ruger 10/22 Bullet Comparison Chart
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