This complete upper showcases the innovative Atlas R-One handguard, engineered for shooters who demand a balance of strength, functionality and lightweight design. Crafted with precision, the R-One handguard maximizes space while maintaining a streamlined profile, ensuring ample room for accessories without unnecessary bulk. The proprietary Atlas attachment system delivers a rock-solid mounting platform, offering exceptional durability and stability while preserving the sleek, ergonomic feel Aero Precision is known for. Designed for superior performance, this upper provides a perfect blend of strength and versatility to meet the needs of any shooting enthusiast.

New enhanced forging that gives the upper receiver a "billet look'', offering improved aesthetics and strength
New picatinny profile that blends seamlessly with our enhanced series handguards, ensuring a clean and functional setup
M4 feedramps ensure that the rounds feed smoothly into the chamber, enhancing cycling reliability and preventing jams during use
Has 1/4 inches takedown pin holes
Laser-engraved t-marks offer precise and clear markings, ensuring quick identification and seamless installation for accessories and parts
The package includes the port door and forward assist already installed, offering easy setup and immediate use without additional assembly
Full top picatinny rail for optional attachments, allowing users to mount various accessories such as optics, lasers or lights for enhanced functionality
Quick disconnect sling socket at the 3, 6 and 9 o'clock positions, offering flexible sling attachment options
Designed to fit low-profile gas blocks, ensuring proper alignment and function for reliable shooting performance
Features a 1.30 inches inside diameter
Has a 1-1/2 inches outside diameter
Compatible with Mil-Spec AR-15 upper receivers and barrels, offering a solid, reliable connection for a secure fit and maximum performance
The 8 inches barrel provides a compact and maneuverable option for close-range engagements, offering quick handling and efficient performance
The barrel features a twist rate of 1:7, designed for stabilizing heavier projectiles
Muzzle 5/8-24 threaded, standard threading size for compatibility with a wide range of muzzle devices
Constructed from 4150 chrome-moly vanadium, this material is designed to withstand extreme pressure and offer superior durability for demanding use
The QPQ corrosion-resistant finish is applied both inside and out, offering a comprehensive solution to prevent rust and maintain durability in all-weather conditions
Gas block measures 3/4 inches, designed to fit standard barrels and provide efficient gas regulation for consistent cycling of the firearm
The gas port size is 0.109 inches, providing optimal gas flow for reliable cycling of the firearm while minimizing recoil and improving accuracy
The pistol length gas system is designed to provide quicker cycling, ideal for compact builds where efficiency and performance are key in shorter-barreled setups
The weight is 18 oz, offering a balance of durability and portability for various tasks
The M4 barrel extension provides reliable performance and compatibility, ensuring smooth cycling and dependable function for your rifle
HP and MPI testing ensures that the firearm components are of the highest quality, free from defects and tested for durability and performance under high stress conditions

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It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

Local Law Compliance

Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.