For sale is a factory built Aero Precision M4E1 enhanced upper receiver with 10.5" barrel and pinned front sight. It includes a Troy fixed rear sight. It has somewhere between 4-600 tounds through it, but I decided to go a different route with my SBR. I will consider trades if you have something you want to offer. I can also add a Toolcraft nitride BCG and Charging Handle for the right offer. 

TEXT 502-419-167NINE