The AR15 Assembled Upper Receiver comes with the port door and forward assist already installed. Match this upper with one of our AR15 lower receivers for a solid and dependable fit.

These solid and dependable uppers give you a great foundation for your AR15 build. Add a barrel and you are one step closer to a complete rifle.

Our state of the art M4E1 platform starts with the M4E1 Upper Receiver. Featuring a one-piece design, it combines the handguard mounting platform with the upper itself.

Aero Precision offers a varied selection to fit your needs. Get your receiver set in either AR15 or M4E1 configurations with color and special edition options.