Aero Precision M4E1-T PRO Complete Upper, 12.5" 5.56 CHF Mid-Length Barrel, 10.3" ATLAS R-ONE

SKU: APUG700703M103-1

In stock

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Aero Precision M4E1-T PRO Complete Upper, 12.5″ 5.56 CHF Mid-Length Barrel, 10.3″ ATLAS R-ONE

Includes PRO Bolt Carrier Group and BREACH Charging Handle

The PRO Upper Receiver Group is built around our PRO 5.56 Cold Hammer Forged Barrel paired with our PRO 5.56 BCG. The ATLAS R-ONE Handguard, BREACH Charging Handle, and VG6 Delta muzzle device turn this assembly into a premium turnkey solution for your next build.

NOTICE: The muzzle device on this upper receiver is not pinned or welded. All NFA rules and regulations apply.


  • 12.5″ PRO 5.56 Cold Hammer Forged Barrel
  • PRO 5.56 Bolt Carrier Group
  • M4E1 Threaded Upper Receiver
  • ATLAS R-ONE Handguard
  • VG6 Delta Flash Hider
  • Mid-Length Gas System
  • AR15 BREACH® Ambi Charging Handle w/ Large Lever – Black

About Cold Hammer Forging

Cold hammer forging differs from other standard barrel manufacturing processes. Rather than drilling a blank and using cutters, buttons, and reamers to machine the chamber and rifling into the barrel, a cold hammer-forged barrel is formed around a mandrel with the rifling inclusions precision ground into it. This process is called “cold” hammer forging because the process is done at room temperature, and the metal is not heated.

Product Information


Aero Precision




5.56 NATO

Coating Type

Black Anodize

Gas System


Gas Block Diameter


Attachment Type


Muzzle Thread


Barrel Length


Made in USA


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