The Aero Precision M5 .308 Assembled Upper Receiver (brand part no. APAR308720AC) is a forged 7075-T6 aluminum upper built for AR-10 pattern .308 Winchester builds, finished in OD Green Cerakote for a durable, non-reflective look that matches a wide range of builds. Aero Precision machines this upper to precise M5 platform tolerances with the port door and forward assist hardware already installed, so it drops onto a compatible M5 .308 lower without any extra parts to source. The DPMS High Profile tang and M4 feedramps keep it compatible with the wide base of existing M5-pattern parts and magazines already on the market. Among our AR-10 uppers, this Aero Precision build suits .308 builders who want a precision-machined upper without sourcing and fitting the port door and forward assist separately.

Key Specifications

• The receiver material is forged 7075-T6 aluminum for strength and light weight.
• The platform is the M5 (.308) pattern, built for .308 Winchester and related cartridges.
• The feedramps are M4 feedramps for reliable feeding.
• The takedown pin holes measure .2795 inches, matching standard M5 pins.
• The tang is a DPMS High Profile (.210-inch) tang for broad lower compatibility.
• The upper ships fully assembled, including the port door and forward assist.
• The finish is OD Green Cerakote.

Frequently Asked Questions

Does this upper include the port door and forward assist? Yes, both come preinstalled, so there’s nothing extra to fit before assembly.

What lower receiver does this pair with? It’s built to Aero Precision’s M5 platform spec and pairs with an M5 (.308-pattern) lower receiver.

Does the tang design limit which lowers it fits? No, the DPMS High Profile (.210-inch) tang is the most common M5 tang style, giving it broad compatibility with M5-pattern lowers.

Buy the Aero Precision M5 .308 Assembled Upper Receiver

A precision-forged M5 upper with the port door and forward assist already installed, this Aero Precision build saves a .308 builder a separate parts order. Order it from our Lubbock, Texas gun shop for shipping straight to your door.