Has anyone else had issues getting the NEA uppers to fit cerero forge lowers ? 4 different NEA uppers will not fit on 2 different key hole marked lowers and a 3rd very old factory Colt lower .
We were thinking maybe it was just the 1 upper so we tried some friends uppers , They all fit American Defense UIC Billet Lower Receiver but 1 of the 3 we could get the pivot pin to engage that was it anyone experienced this before ?
We were thinking maybe it was just the 1 upper so we tried some friends uppers , They all fit American Defense UIC Billet Lower Receiver but 1 of the 3 we could get the pivot pin to engage that was it anyone experienced this before ?
Last edited:


















































