Quick view Aero Precision Aero Precision M5 Ar10 Assembled Upper Odg $180.00 $157.56 The M5 .308 Assembled Upper Receiver comes with both the port door and forward assist hardware preinstalled. Forged from 7075-T6 aluminum, this assembled upper is precision machined to accept standard .308 components and is the perfect upper for your big... Compare Add to Cart