What you say is true. I've never found anywhere specifying TQ wrench length for TQing the barrel nut. Truth is, after getting a few assembled uppers under my belt, I don't use a TQ wrench anymore. I don't advocate others doing the same because I don't know their level of skill or experience. I also assemble one upper at a time and give the barrel nut my full attention. If I were working a line, I would definitely use a TQ wrench in case my attention wanders.
For the most part, true. But I have run into prints with very specific TQ specs, such as using the TQ extender inline with the wrench, or TQ to so many degrees after snugging the fastener and so on.This is why when you make assembly drawings you put the actual torque down not the indicated torque for the collection of tooling assemblies. Because that one specified piece of tooling with break and somebody will have to figure out to do the job with non-specified tools, or somebody will change the design of the specified tool without telling you and for a year everything will be built wrong, until you find out.
In aviation, I'm not allowed to consider an approved manual or any approve data a reference. It has the force of federal regulation.
But I do get your point. I also agree with you and Lysander that we're given wide latitude and the important thing is to apply enough TQ to the barrel nut that it doesn't come loose.
I asked for your input because I want to learn and avoid working in the vacuum of isolation.
Thanks to you, Lysander and GH41 for the discussion.
The number of folks on my Full Of Shit list grows everyday
I am American
C4IGrant once mentioned 40 ft pounds as the sweet spot for barrel torque. Might give him a shout for clarification. Was in a thread where he built a blaster using a Bravo stainless barrel shooting really tight groups. I think he showed us something like a 1/2 inch group.
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