I’ve had a couple of 6920s and they were nice. I switched over to the 6940 a couple years ago and I really like the monolithic upper much better. I use mine for training and have about 5K rounds through it, no failures.
I would recommend a drop in single stage trigger. Definitely a nice upgrade.
Not a newbie, but I'm curious on the "PM Rules". I usually do everything on PM's until I am inbound for a meet. But I didn't know there were rules. Can anyone explain?