ARs are such precise machines the torque on the barrel nut has to be between 30 ftlbs and 80 ftlbs ( I'm sure you can find other values such as 35 - 80 if you want to argue the size of the window ) . The German torque value is between good-n-snug and good-n-tight .
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That’s the TDP spec torque range for a USGI steel barrel nut without shims. Many manufacturers use aluminum barrel nuts with and without shims, and they will specify a torque range to achieve proper tension.
There is much irony in you believing good-n-snug is okay, but then say you wouldn’t let most so called builders touch your guns.