Sorry no way to provide pics at the moment.
Got a new upper that has several teeth bent,rounded off and or missing on the barrel nut.
Damaged teeth are at about 10 and 2 o'clock.All are rolled/broken off in a clockwise direction.
IMHO it looks as if there were several assaults on the nut by the amount of dings and rolled material.Almost peened looking in areas.
I contacted the manufacturer on this and Im waiting to see what they say.
While Im waiting,what is the experienced opinion of the folks here on seeing something like this on a barrel nut?
Over torqued,poor tooling or ham fisted monkey?

