[url=http://www.jobrelatedstuff.com/content/books/TM9-1005-319-23.pdf]TM 9-1005-319-23[/url]
2.6MB
I'm at work so I don't have my TM handy but 80 ft/lbs is what sticks in my mind. It's rare to reach 80 w/o lining up the teeth for the gas tube. If that does happen loosen the nut and retighten, repeat until the nut lines up properly. Unless, like some of us, you have a drawer full of barrel nuts. Use lots of grease and watch the engagement between your wrench and the nut. The teeth tend to break off around 100 ft/lbs so it's difficult to get the nut too tight. Torque limits, in this case, are designed to prevent the assembler from doing harm to himself (wrench slips) his tools (tool snaps) and the parts (teeth break, threads strip). Tight is tight, loose is loose. Worry about the minimum, the rest will fall in place.