The old adage is: When you open a can of worms, you always need twice as big of can to get them all back in!" So it is with the barrel tightening task... But, I have since discovered, it is friction, holding, and torque, turning... and not much else enters in... the undercut on the barrel flange, is most likely there to flatten out the torque needed to index the barrel properly... Meaning, if you can hold the barrel, without scratching it, and turn the receiver without distorting it... you have a range the it will tighten in to the proper indexing position... We know where it starts, approximately??... where this range ends, is, as of yet, not known to me, as I can't afford to go to the yield point on my dollar....i.e. receivers aren't growing on trees!
... all the previous info on this thread is important, and definitely points the way to successful installations... we get better as we go... best to all, til....lat'r....GT
