You can find the Aero Precision Assembled M5 (.308) Upper Receiver Kodiak Brown here.
The Aero Precision Assembled M5 (.308) Upper Receiver is made from forged 7075-T6 aluminum and precision machined to accept standard .308 components. Features include laser-engraved T-marks, M4 feedramps, and comes with the port door and forward assist already installed. DPMS High Profile (.210) Tang.
Weight: 14oz
Color: Kodiak Brown Anodized