Mine had a short-stroking issue after the first 60 rounds. Tried several different ammo types to no avail. Adjusted the gas block to the specs that Adams Arms gives on their youtube video and still didn't fix the problem. Sent it back to the manufacturer and it was back within a week, with the gas block adjusted correctly, a new bolt and carrier group and a new upper receiver (I think the last two items were replaced as a matter of course). Now it's a beast. I'm still breaking her in, but she runs so smooth and it's made of mil-spec components and many that actually exceed mil-spec. The company's warranty is the best in the business: If you are the 15th owner and it's had 20,000 rounds through it just send it in and they will make it run right. No questions asked.
Big J from