The CEO of Larue posts pictures of the groups shot with his rifles at times on IG, the groupings are stellar. I think the current upper they sell had groups between .2 and .5, though it’s been a while since I saw the post.
Not all do all their own machining but most do.In all cases, unless you know who's doing the machining for all these companies that do all their own machining.
I stand behind my statement, I see no better results from top tier guns than cheaper ar15s with the exception of bear creek, they don’t seem to have a clue.