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Having assembled a couple three fixed stock AR lowers (including a couple of actual M16's in the Army) I was unaware there was an actual torque spec for the receiver extension (aka buffer tube).
35 to 39 ft-lb.
Says so right in the TM.
I've always just given it an "ugga-dugga" or "one grunt" then put the stock on.
Considering that the stock screw acts as a jam-nut on the extension, there's no need to get medieval on the thing.
Just for the record, the locking ring for a carbine receiver extension is supposed to be the same 35 to 39 ft-lb. One "ugga-dugga" and staking it has never had a failure for me.
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