What are you wanting to do with it?
Personal defense/duty rifle?
I have shot a DPMS in .308, 1 round. The extractor froze and wouldn't eject the case. The bolt wasn't machined correctly. It was exchanged for a new bolt and then it was fine according to my brother. He sold it right after that.
I have 100 or so rounds out of a Larue PredatAR in .308 with a 18" bbl. Both suppressed and unsuppressed. Not a single bobble.
I am no longer participating in gun forums.