Well I'm old (and likely a mistake).
When I started assembling AR carbines the available locking ring wrenches (pre castle nut) were about 4 or 5 inches long:
OldWrench.jpg
So a greatly reduced torque value vs a rifle extension didn't seem outlandish. I used more than 3.33 ft-lbs, but no where near 40 ft-lbs.
I learned something today, so I'll fix it.
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