The FN USA FN15/AR upper receiver assemblies are engineered to fulfill the rigorous requirements of law enforcement, military personnel, competitive shooters and sports enthusiasts. These complete upper assemblies are meticulously designed to address specific user needs. Stringent quality and compliance standards are adhered to, ensuring that the highest levels of engineering and craftsmanship are applied during production and testing. This commitment guarantees consistent and optimal performance.

M16 style barrel profile
Rifle-Length gas system - a gas-operated mechanism in firearms, utilizing a longer gas tube to cycle the action, enhancing reliability and reducing recoil
A2 front sight post assembly
Oval handguard featuring a two-piece, single heat shield design

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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.