Well, got my rebarelled upper back (see post# 25) and they did send a NEW bolt carrier assembly (which has the more modern upgraded extractor spring)as my original never did appear. There was no word/instruction on it if it was headspaced etc., to this particular barrel. Not willing to risk my face being blown off, I took it down to my local gunsmith, who thankfully is experienced with the AR series. Headspace was fine but gas tube alignment was "mildly" off...not apparently enough to cause malfunction but perhaps wear out one side of the gas tube over time. $30 and a mild adjustment later and it was off to the range. The piece was reliable and accurate....federal match shot average .86" ( three X 3 shot groups at 100 m). Ball ammo (Winch 55 gr and 62 gr respectively) averaged 1.12" and 1.5" respectively. Only 2 groups of each (time constraints) were shot using a 9 magnification scope.
I was able to zero the iron sights this time (as on the first rebarrel I had run out of elevation and windage adjustment and couldn't zero the upper).
It took a long time, but I'm happy now, and I give them some credit for that. Everyone messes up at some time or other and how errors are handled reveals alot about who poeple are. Mr Dlask's company does need to address QC problems... if he does they will do well as Canada needs knowledgeable in house AR/military rifle gunsmiths.