The FN M16A4 upper receiver is a sought-after component among firearm enthusiasts and builders, known for its adherence to military specifications and exceptional craftsmanship. Manufactured by FN Herstal, a company with a rich history in producing firearms for military and civilian markets, the M16A4 upper receiver offers reliability and performance for AR-15 platform builds.
Key Features of the FN M16A4 Upper Receiver
- Mil-Spec Construction The FN M16A4 upper receiver is constructed to meet or exceed military specifications, ensuring durability and compatibility with standard AR-15 components.
- Material and Finish Crafted from high-quality aluminum, the upper receiver features a hard-coat anodized finish, providing resistance to corrosion and wear.
- A2 Fixed Carry Handle The traditional A2 fixed carry handle includes integrated rear sight adjustments for windage and elevation, maintaining the classic M16A4 aesthetic and functionality.
- 20-Inch Barrel Paired with a 20-inch chrome-lined barrel, the upper receiver offers enhanced accuracy and longevity, suitable for various shooting applications.
Compatibility Considerations
- Lower Receiver The FN M16A4 upper receiver is compatible with standard AR-15 lower receivers. However, ensuring that the lower receiver meets mil-spec standards is crucial for optimal fit and function.
- Handguards and Accessories The upper receiver typically accommodates standard rifle-length handguards. Users seeking to install free-floating handguards or rail systems should verify compatibility with the fixed front sight base.
Acquiring the FN M16A4 Upper Receiver
- Authorized Dealers Purchasing from authorized FN dealers ensures the authenticity and quality of the upper receiver. A list of authorized dealers is available on FN America’s official website.
- Online Retailers Reputable online firearm parts retailers may offer the FN M16A4 upper receiver. It’s essential to verify the credibility of the seller and ensure compliance with local laws and regulations regarding firearm components.
- Pricing As of March 2025, the FN M16A4 upper receiver’s price varies based on availability and market demand. Prospective buyers should consult multiple sources to obtain current pricing information.
FAQs
- What distinguishes the FN M16A4 upper receiver from other AR-15 uppers?
The FN M16A4 upper receiver is manufactured to military specifications, offering a fixed carry handle and a 20-inch chrome-lined barrel, reflecting the traditional M16A4 design. - Can I install the FN M16A4 upper receiver on any AR-15 lower receiver?
While the upper is designed to fit standard AR-15 lower receivers, ensuring that the lower is mil-spec enhances compatibility and performance. - Is the FN M16A4 upper receiver suitable for modern optics?
The fixed carry handle design limits direct mounting of modern optics. However, carry handle adapters are available to facilitate optic installation. - Does the FN M16A4 upper receiver come with a bolt carrier group (BCG) and charging handle?
Availability varies by retailer. Some packages include the BCG and charging handle, while others may require separate purchases. - What is the twist rate of the barrel on the FN M16A4 upper receiver?
The barrel typically features a 1:7 twist rate, optimized for stabilizing a wide range of bullet weights.
Incorporating the FN M16A4 upper receiver into an AR-15 build offers enthusiasts a blend of historical design and reliable performance. Whether for target shooting or collection purposes, this upper receiver stands as a testament to FN Herstal’s commitment to quality and precision.
