M5 .308 Assembled Upper Receiver - Anodized Black

Aero Precision

MSRP: $169.99
Our Price: $144.49
(You save $25.50 )
(3 reviews) Write a Review

Out of Stock

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!



  • 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!

3 Reviews Hide Reviews Show Reviews

  • 5
    M5 upper squared

    Posted by Andrew on Jun 29th 2020

    Received my upper flawless and the squaring looked perfect. I almost bought the rig myself but the low cost of it being professionally done it would be silly to not have it done..Thank you, awesome job, absolutely perfect .

  • 5
    M5 Upper

    Posted by Mattie on May 30th 2020

    I love Aero Precision and the "BEAR" guys make a good product great!!

  • 5

    Posted by Tyler on May 20th 2020

    Came super fast looks and fits perfect. Will order from bexar again