The AR15 Assembled Upper Receiver comes with the port door already installed. This specific model does not have forward assist provisions. Forged from 7075-T6 aluminum, this assembled upper is precision machined to mil-spec M16/M4 specifications and features M4 feedramps. Match this upper with one of our AR15 lower receivers for a solid and dependable fit. 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. Features: M4 Feedramps .250 takedown pin holes Lazer engraved T-marks No forward assist provisions Port door installed Includes: AR15 Assembled Upper Receiver Without Forward Assist in Anodized Black SPECS Specs Made In America? Yes Platform AR15 Material Machined from 7075-T6 forged aluminum Select Your Finish Anodized Black Compatibility Works with standard AR15/M16 components Weight(s) 6.5oz Other No forward assist provisions