5.7 AR Upper: A Comprehensive Guide
Are you looking to enhance your firearm collection or are you a firearms enthusiast seeking to understand the intricacies of modern firearm technology? The 5.7x35mm cartridge, commonly used in the 5.7 AR upper, has gained popularity for its unique blend of power, accuracy, and compactness. In this detailed guide, we will delve into the various aspects of the 5.7 AR upper, from its history to its performance, ensuring you have a comprehensive understanding of this remarkable firearm.
History and Development
The 5.7x35mm cartridge was developed by FN Herstal, a Belgian firearms manufacturer, in the early 1990s. The cartridge was designed for the FN P90 personal defense weapon (PDW), which was intended to replace the 9mm Parabellum cartridge used in the FN FAL rifle. The 5.7x35mm cartridge offered improved terminal ballistics, reduced recoil, and a higher velocity compared to the 9mm cartridge.
The 5.7 AR upper was introduced to the market in the late 1990s, offering shooters the ability to utilize the 5.7x35mm cartridge in an AR-15-style rifle. This combination provided a lightweight, compact, and highly effective firearm for various applications, including law enforcement, military, and civilian use.
Design and Construction
The 5.7 AR upper is constructed using high-quality materials and precision engineering. The upper receiver is typically made from 7075-T6 aluminum, which is known for its strength and durability. The barrel is made from stainless steel, ensuring corrosion resistance and longevity.
The 5.7 AR upper features a gas-piston operating system, which is known for its reliability and reduced wear on the firearm. The gas system is designed to provide consistent performance, even in adverse conditions.
One of the standout features of the 5.7 AR upper is its compact design. The firearm is significantly shorter than its 5.56mm AR-15 counterpart, making it easier to maneuver in tight spaces and more comfortable for concealed carry.
Performance and Ballistics
The 5.7x35mm cartridge offers a unique blend of performance characteristics. The bullet has a high velocity, which allows for excellent terminal ballistics and reduced felt recoil. The cartridge is also known for its excellent penetration capabilities, making it effective against soft and hard targets.
When compared to other popular calibers, such as the 9mm and .40 S&W, the 5.7x35mm offers superior performance in terms of penetration and terminal ballistics. However, it is important to note that the 5.7x35mm cartridge has less energy than these other calibers, which may affect its effectiveness against larger, more robust targets.
| Cartridge | Velocity (fps) | Penetration (inches) | Energy (ft-lbs) |
|---|---|---|---|
| 5.7x35mm | 2,200 | 18 | 300 |
| 9mm | 1,200 | 12 | 300 |
| .40 S&W | 1,200 | 12 | 400 |
Compatibility and Accessories
The 5.7 AR upper is compatible with many accessories and components designed for the AR-15 platform. This includes magazines, optics, stocks, and grips. However, it is important to ensure that the accessories are specifically designed for the 5.7x35mm cartridge to ensure optimal performance and safety.
One of the most popular accessories for the 5.7 AR upper is the FN 5.7 magazine. These magazines are known for their reliability and capacity, typically holding 20 rounds. Other compatible magazines include the Magpul PMAG and the Lancer L5.
Conclusion
The 5.7 AR upper is a highly versatile and effective firearm that offers a unique blend of performance, compactness, and reliability. Whether you are a law enforcement officer, military personnel, or a civilian shooter, the 5
