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Aero Precision APAR610401AC: The AR15 Assembled Upper Receiver comes with the port door already installed. This specific model does not have forward assist. Forged from 7075-T6 aluminum, this assembled upper is precision machined to mil-spec M16/M4 specifications and features M4 feed ramps. Match this upper with any Mil-Spec AR-15 lower receiver for a great custom AR-15.
Note from the Manufacturer: "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."