I read that thread in the competition section too. I have the exact problem they spoke about. The trigger started out fantastic, but after 500 rounds started to not release the first stage. When it does release I often take up the first stage right into a hair trigger. Not good at 600 yards when the slightest movement can put you in the 8-ring. I've used moly and clp and it has only become slightly better.
That's my only negative, other than that, I love my BM DCM. It's my first AR and has placed me at low expert class.
My wife has a BM DCM too, does not have a trigger problem to BM's credit, and on her first time shooting 600 yards shattered a scoring disk pin which was already in the X-ring!