HiBC, standard torque spec, using the G.I. adapter and a standard barrel nut, is 35-80 ft-lb.
Some aftermarket manufacturers recommend other torque specs, and some tools (like mine) require recalculating the torque setting, due to different length and orientation.
A few manufacturers actually use the "beyond spark plug tight, but shy of lug nut tight" concept you mentioned.
Something like:
"Thread nut on until it stops sharply. Tighten until gas tube will pass without interference. If alignment can't be achieved without substantial force, shims or receiver facing may be required..."
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Don't even try it. It's even worse than the internet would lead you to believe.
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