Suppressor thread question

[Hermitage]

I came across the same problem yesterday.
Rifle is threaded 1/2x20 and the suppressor is also 1/2x20 but after 3 turns it binds. Thread protector goes on fine.
I should have included the suppressor with the barrel when I sent it to the gunsmith and his tolerances must also be out.
I'm packing mine up again and sending it back to him on Monday with the suppressor so he does it right this time....let him sort it out at his cost.
I'm not going to start playing with the suppressor threads...I suggest you do the same.