Aero Precision M4E1 Threaded 11.5" 5.56 Carbine Barreled Upper - 9" M-LOK ATLAS R-ONE

Manufactured by Aero Precision
SKU: APAR700702M29
MPN: APAR700702M29
Manufactured by Aero Precision
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Note:The muzzle device is not pinned or welded, so this upper is only suitable for a pistol lower unless used for a legal SBR. Know your local laws and regulations.

Aero Precision is an undeniable powerhouse in the AR-15 world, and that legacy continues with the new M4E1-T ATLAS R-One Complete Upper Receivers. Lightweight but rugged, Aero Precision’s ATLAS attachment system is slim in the hand but maintains all the durability Aero Precision is known for. This upper comes assembled on an M4E1 threaded upper receiver with an 11.5” CMV 5.56 Barrel and includes a 9-inch ATLAS R-One M-LOK handguard. The new ATLAS R-One handguards are as function as they are aesthetic. These AR-15 handguards utilize 2 mirrored, tapered locking nuts that provide an evenly distributed clamping pressure across a custom barrel nut using a turnbuckle screw. QD sling cups are built into the side, providing an excellent base for a duty setup. With a carbine-length gas system and low-profile gas block, this upper receiver will function reliably even in difficult conditions. This upper receiver does not include a BCG or charging handle, which are necessary for function.  Sights are not included, but a wide variety of sights and optics are available here at Primary Arms.

  • M4E1 Threaded Assembled Upper Receiver
  • ATLAS R-ONE Handguard of choice
  • 11.5" 5.56 CMV Barrel, Carbine Length
  • Low Profile Gas Block and Carbine Length Gas Tube
  • Product comes assembled

Aero Precision takes some of the most state-of-the-art manufacturing techniques and equipment derived from their work in the aerospace industry and applies it to their products in the firearms industry. They have utilized their knowledge from years of building aircraft components to design and engineer AR-15 handguards, receiver sets, scope mounts, and more. They treat every product as if it were a precision flying machine and adhere to strict quality standards to ensure law enforcement, military, and civilian customers receive a product they can rely on.
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AssemblyBarreled Assemblies
Barrel CoatingSalt Bath Nitride
Barrel ContourGovernment
Barrel Length11.5
Barrel LiningSalt Bath Nitride
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandAero Precision
Caliber Gauge5.56 NATO
Gas System LengthCarbine
Gas System TypeDirect Impingement
Handguard9 in M-LOK Rail
Muzzle DeviceA2 Flash Hider
Thread Pattern1/2 X 28
Twist Rate1:7

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

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