The AR-15 platform's modularity is a key feature, allowing for customization and upgrades with relative ease. A crucial component in this system is the upper receiver group, often acquired as an A2 upper parts kit. This guide dives deep into what constitutes an A2 upper parts kit, its components, variations, and considerations for choosing the right one for your build.
What is an A2 Upper Parts Kit?
An A2 upper parts kit encompasses all the essential components needed to assemble the upper receiver of an AR-15 rifle, excluding the upper receiver itself. The "A2" designation refers to the style of the handguard—the classic, long, and slender profile commonly associated with the M16A2 rifle. These kits typically offer a cost-effective way to build or upgrade your AR-15, providing a complete set of parts instead of sourcing them individually.
Key Components of an A2 Upper Parts Kit: A Detailed Breakdown
A typical A2 upper parts kit includes the following components:
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Bolt Carrier Group (BCG): The heart of the firearm's action, responsible for cycling rounds. Quality BCGs are crucial for reliable function and longevity. Look for reputable manufacturers and consider features like chrome lining for enhanced durability.
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Charging Handle: Used to manually cycle the bolt carrier group, preparing the rifle for firing. Different charging handle designs offer varying degrees of ergonomics and ease of use.
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Forward Assist: A small lever on the right side of the upper receiver, used to assist in chambering a round if needed. While not essential, it can be helpful in certain situations.
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Ejection Port Cover: A small cover that closes the ejection port when not in use, keeping out debris.
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A2 Front Sight Post: A post-style front sight integrated into the A2 handguard, providing a consistent point of aim.
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A2 Handguard: The characteristic long, slender handguard defining the A2 configuration. While functional, it offers limited real estate for accessories.
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Dust Cover: A small cover situated above the ejection port, providing minimal protection against dust and debris.
Variations and Considerations When Choosing an A2 Upper Parts Kit
While the core components remain consistent, variations exist within A2 upper parts kits:
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Material: Components can be made from various materials, including steel, aluminum, and polymers. Steel is generally more durable but heavier, while aluminum and polymer offer lighter options with varying levels of durability.
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Manufacturer: Reputable manufacturers ensure quality control and consistent performance. Researching different brands and reading reviews can help you identify reliable options.
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Finish: Various finishes are available, including hardcoat anodizing, phosphate coating, and others, each offering varying levels of corrosion resistance and durability.
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BCG Type: Consider the type of BCG (e.g., full-auto, semi-auto) to ensure compatibility with your intended use.
Beyond the Basics: Upgrading and Customization
While an A2 upper parts kit provides a solid foundation, numerous upgrade paths exist. Consider swapping the A2 handguard for a modern M-LOK or KeyMod handguard to increase accessory mounting options. Upgrading to a different charging handle or BCG can enhance ergonomics and reliability. Always ensure compatibility when making modifications.
Conclusion: Building Your AR-15 with Confidence
Selecting the right A2 upper parts kit is a significant step in building or upgrading your AR-15. Careful consideration of the components, variations, and potential upgrades ensures you get a reliable and functional system that meets your specific needs. Remember to prioritize quality components from reputable manufacturers for optimal performance and longevity. Thorough research and understanding of AR-15 mechanics will greatly aid in making informed choices.
