I loaded my mags and cycled slowly while watching.
When a fail to feed happened the back of the brass failed to pop up into the bolt when pushed forward till it contacted the face of the barrel, not lined up to the proper alignment to the chamber.
It always happens with 3 and 4 rds left in the mag.
Do I need to cut a small amount of the forward edge of the top curved part of the feed lips? Or opening or spreading the feed lips so the round pops up earler?