Well do you think the QC would improve if the castle nut was tighten and staked at one station and then continued moving while the person installing the castle but just kept installing castle nuts.
Look best I can tell the time if takes me to assemble an AR it could never be profitable unless I assembled things in bits and pieces or charged 3 times what it would be worth.
I liked this video it is neat to see how thing were done 50 years ago, but it seems we have advanced so many ways but not others.
No, I do not believe creating an assembly line would increase quality control.