Resurgent Arms, LLC
The AR15 Assembled Upper Receiver comes with the port door already installed. This specific model does not have a forward assist.
Forged from 7075-T6 aluminum, this assembled upper is precision machined to mil-spec M16/M4 specifications and features M4 feedramps.
Note: The no-forward assist upper receivers use a custom forging designed to work specifically with mil-spec port doors. It may not work with aftermarket port doors.