Own a true piece of firearm history from the makers of the world's most battle-proven firearms. The FN 15 Military Collector Series M16 upper receiver assembly is an authentic reproduction of the legendary rifle, built to FN's and the U.S. military's exacting specifications. Featuring a 20 inches, 1:7 right-handed, button-broached barrel, this upper is chrome-lined and chambered in 5.56 x 45mm for exceptional durability and reliability. It comes equipped with a complete M16-style MIL-SPEC bolt carrier group, including a high-pressure tested and magnetic particle inspected bolt crafted from Carpenter 158 steel. Completing this faithful reproduction is a Knight's Armament M5RAS quad-rail with adapter covers, delivering an iconic look and unmatched functionality. Whether restoring a classic or building a precision M16-style rifle, this upper receiver assembly is the ultimate choice for collectors and enthusiasts alike.

The Knights Armament M5 RAS adapter rail provides secure mounting with adapter covers included
A 20 inches button-broached, chrome-lined barrel with an A2-style compensator ensures durability, improved barrel life and recoil reduction
An M16 style Mil-Spec Bolt Carrier Group features an HPT/MPI tested bolt made from carpenter 158 steel for exceptional durability
The Matech rear sight is engineered for precision, offering quick and accurate targeting with its adjustable features to suit a variety of shooting scenarios

Report incorrect product description

Reviews

Q & A

Retail Stock

Compliance

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.