Added a couple of these to my order from CDNN this evening while they’ve got cheap flat rate shipping going on. These are the square marked flat top uppers with dust cover and forward assist.
https://www.cdnnsports.com/ar15-upp...paign=CDNN+AR15-AR10+Parts+12-31#.XgvYvyRMGEd
https://www.cdnnsports.com/ar15-upp...paign=CDNN+AR15-AR10+Parts+12-31#.XgvYvyRMGEd