These are custom built by Black Phase Tactical, ready to fire, 100% complete upper receiver groups. Professionally assembled with high quality parts.
Parts list:
Colt cage code upper receiver
Colt charging handle
Colt BCG HP/MPI
Colt 10.3" barrel w/ Crane spec .070" gas port
Colt a2 flash hider
Colt gas tube & roll pin
Geissele gas block
Geissele MK8 rail (black or fde)