The complete upper assembly incorporates the R-ONE handguard engineered to optimize both size and weight. Despite its streamlined design, the R-ONE handguard offers ample space to support various attachment requirements for the end user.

The newly improved forging process imparts a "billet look" to the upper receiver
The newly designed picatinny profile integrates seamlessly with the Aero Enhanced series handguards' upper receiver
Upper receiver with M4 feedramps
Upper receiver with 1/4 inches takedown pin holes
Upper receiver with laser-engraved T-marks
The upper receiver is equipped with an installed port door and forward assist
Comprehensive top picatinny rail designed for optional accessory attachments on the handguard
The handguard is equipped with quick disconnect sling sockets located at the 3, 6 and 9 o'clock positions
Handguard designed for compatibility with low-profile gas blocks
Handguard with an internal diameter of 1.3 inches and an external diameter of 1-1/2 inches
Compatible with military specification (mil-spec) AR-15 upper receivers and barrels
5.56x45mm 18 inches rifle-Length barrel
Barrel constructed from 4150 chrome molybdenum vanadium (CrMoV) steel with a quench-polish-quench (QPQ) finish
Twist rate is 1:7
Gas block journal with a diameter of 3/4 inches
Rifle-Length gas system
M4 feed ramp extension barrel assembly
Barrel tested by HP and MPI
A2 flash suppressor

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Shipping Restrictions

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.