xtry51
NES Member
99% it's gas related. Make sure the gas block is aligned. Maybe pull it forward and ensure there isn't a burr in the barrel port and reseat it. Then go to a lighter buffer.
If you have a newer cell phone, have someone take a super slow mo video of a round being fired close to the ejection port. You'll be able to see if the bolt is fully cycling.
If you have a newer cell phone, have someone take a super slow mo video of a round being fired close to the ejection port. You'll be able to see if the bolt is fully cycling.