First time posting here, I thought I would share. Just built my first AR, had ejection problems my first time out. First 50 rounds thru no problems, then I started having issues. Almost every other round FTE. I stripped the rifle down and discovered the problem on the bolt, the roll pin holding the ejector in place was not driven in all the way and catching on the keys slowing the bolt/carrier down. Drove the pin in and staked it for sake keeping, no damage to the keys. Have to wait until next session to confirm fix. Once everything checks out I'll post back. Bolt/carrier assembly from del-ton.