This is a factory built upper, it has 200 rounds through it; parts list will be below. These uppers are no longer available, it was a run that ADM did for a brief moment.

ADM/Rosco billet upper receiver

VLTOR/Rosco charging handle

Rosco BCG

Rosco K9 12.5" Sage Dynamics barrel w/ Rosco gas block

ADM Contract Overrun rail

Dead Air 3 Prong

No trades, text is preferred for quick response; 808-366-36zero8