From what I've read, most problems with feeding go away after shooting the rifle 100 or so rounds... and it's stressed that PLENTY of lube on the BCG is required for initial break in. I can't remember his screen name, but one member here never could get his to run right.
My personal experience mirrors what I've read. I bought a NIB DPMS LR-65 (6.5 Creedmoor) and for the first 30-40 rounds, it was a single shot rifle. After HEAVY lube on the BCG, the next 40-50 rounds resulted in about 5 FTE's, last time out, again with HEAVY lube, the 30-40 rounds I fired functioned fine, All I use is hand loads by the way.
I'm sure there will be various opinions and comments reference this... but I'm very happy with my LR-65... others I realize have not had it so easy... me, I'd buy another.