Is there a square hole in my nut wrench? Never!
All of my after market barrels have a class 3 thread so two threads in and there is zero play.
In Spec I am going to guess you mean how tight do you tighten the nut. Personal to me only, I tighten the nut so that it cannot be removed by hand only. The nut is simply a lock nut, keeping the barrel where its suppose to be.
Neal
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