Somehow, I seem to have the one that runs fine. Anything from the cheap surplus Norc ammo, to factory loads between 150-168 grain off the shelf. I also do not have the cam pin "nick" that some seem to be experiencing. The single issue I have experienced appears to be a mag issue, rather than a rifle issue. I'm only at about 500 rounds so far, so who knows what the future holds. All in all, I have run 8 different types of ammo through it, with steady results.
IMHO, nothing I have read in any threads here, seem to be filled with catastrophic failure, like some are making things out to be. I think that is reinforced by the idea that there are still buyers on the second pre-order. Teething issues? Maybe. I think Jerry from Mystic has brought more information to the table with some of his initial observations, posted in his thread.
He!!, I'm so pleased with mine regarding functionality, that I am putting together funds for another for the wife. Made the mistake of letting her have a day on it, and it was love at first mag dump! Just my initial observation as an inexperienced AR10 and .308 AR owner....