First off is it an A2 rifle stock or collapsible stock. Did you have the bolt carrier almost dripping with lube? How far does the gas tube go into the upper? Does it go to the middle of the cam pin cutout or is it short of the middle of the cam pin cutout? PSA will fix it eventually but you can have it running right quicker with a few parts. Mine needed a longer gas tube. Pic of where the gas tube should end.