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That is fine if you have a lot knowledge or "feel" for what 80ft LBS feels like.
When I install a barrel nut, I use a cheater bar and the wrench/crows foot. I tighten and loosen the nut somewhere between 6-9 times. With the barrel nut LOOSE, I switch to my torque wrench and set it for 55-60FT LBS. I tighten down the nut.
Doing it this way makes sure that I don't go over the 80FT LBS ceiling and that the threads are fully seated.
C4
The manual states 30-80 ft./lbs. which is to take into account the variances in threads and the design of the nut. If you hit 30 and it lines up-great. Then finish it off. If not then you will have to go more. But, if you have already gone past 30 and everything seems OK leave it alone.
Owner/Instructor at Semper Paratus Arms
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I got alot to learn. 30 to 80 seems like such a big margin.
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