Sounds a lot like my 11.5" FrankenAR. Eagle Arms lower (Armalite by another name) and Cerro upper. The only problems I've ever had with it were all mag-related (one particular 20/5 rounder will feed reliably but won't lock into the well when the bolt is forward)
I have a feeling that the straight box magazines are more reliable than the curved banana ones. Any truth to this?
How do the actual armalite 30/5 round magazines fair with the green followers from marstar?




















































