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Design and Build Quality
The FN 5.7 AR Upper is a firearm that stands out in terms of design and build quality. Crafted with precision, this upper receiver is designed to be a reliable and durable component for your AR-15 rifle. The receiver is made from high-quality 7075-T6 aluminum, which is known for its strength and resistance to corrosion. The anodized finish not only adds a sleek look but also provides additional protection against wear and tear.
Caliber and Performance
One of the standout features of the FN 5.7 AR Upper is its chambering in 5.7x28mm. This caliber offers a unique combination of power and accuracy, making it an excellent choice for both recreational shooting and tactical applications. The FN 5.7 round is known for its high velocity and flat trajectory, which allows for precise shots at longer distances. The upper receiver is designed to handle the high-pressure rounds with ease, ensuring consistent performance.
| Caliber | Velocity (fps) | Effective Range (yards) |
|---|---|---|
| 5.7x28mm | 2,200 | 500 |
Barrel and Gas System
The FN 5.7 AR Upper comes with a 16-inch barrel, which is the standard length for this caliber. The barrel is made from chrome-molybdenum steel, ensuring excellent durability and accuracy. The rifling pattern is designed to optimize the performance of the 5.7x28mm round, providing consistent bullet flight and accuracy. The gas system is a direct impingement design, which is efficient and reliable, ensuring consistent cycling of the firearm.
Handguard and Ergonomics
The handguard on the FN 5.7 AR Upper is a free-float design, which allows for better accuracy and reduces the likelihood of barrel harmonics. The handguard is made from high-quality polymer, providing a comfortable grip and reducing weight. The design also allows for easy attachment of accessories, such as optics, lasers, and flashlights. The ergonomics of the upper receiver are well thought out, with a flat-top design for mounting optics and a comfortable cheek weld for improved shooting experience.
Magazine Compatibility
The FN 5.7 AR Upper is compatible with standard 5.7x28mm magazines, which are widely available. The magazine well is designed to ensure a smooth feeding of rounds, reducing the likelihood of malfunctions. The magazine release is easily accessible and operates smoothly, allowing for quick magazine changes when needed.
Overall Impressions
The FN 5.7 AR Upper is a high-quality, reliable, and accurate firearm component. Its design and build quality are top-notch, and the performance is exceptional. Whether you are a recreational shooter or a tactical operator, the FN 5.7 AR Upper is an excellent choice for your AR-15 rifle. Its unique caliber, efficient gas system, and ergonomic design make it a versatile and effective firearm component.
