Aero Precision M5 .308 Assembled Upper Receiver - Anodized Black

The M5 .308 Assembled Upper Receiver comes with a standard threaded front that accepts DPMS pattern AR-10 barrel nuts and handguards, and both the port door and forward assist hardware are preinstalled for your convenience. Forged from 7075-T6 aluminum, this assembled upper is precision machined to accept standard DPMS pattern large frame AR components and is the perfect upper for your big bore build. While .308 is in the name, the M5 Uppers are perfectly suited to shoot cartridges such as .308 Win/7.62x51 NATO, 6.5 Creedmoor, 6mm Creedmoor, .243 Win, .260 Rem, and more!

Features:

• M4 Feedramps
• .2795 takedown pin holes
• Laser engraved T-marks
• DPMS High Profile (.210) Tang
• Includes port door and forward assist

Squaring the Receiver Face

At Bexar Arms, we offer you the option to have the face of your receiver squared. Squaring the face of the receiver is an essential step in accurizing your AR pattern rifle, and ensures your barrel seats firmly and completely with the receiver face and is perfectly inline with the BCG raceway in the upper. This allows for a more consistent bolt engagement which evenly distributes force among all of your bolt lugs instead of only a few. This consistent lockup and complete barrel seating can help increase your AR's maximum accuracy potential as well as extend the life of your bolt. While squaring your receiver face is 100% unnecessary for your rifle to function, if you're looking to squeeze the absolute most performance out of your AR pattern rifle, we highly recommend it!

To learn more about receiver squaring, click here to see our blog post on the topic!