The AR-15 platform's versatility is legendary, and a significant part of that stems from the modularity of its design. One key component offering substantial customization is the upper receiver, and the 20-inch A2 upper is a classic choice for many shooters. This detailed guide explores the features, advantages, and factors to consider when choosing a 20-inch A2 upper receiver for your build.
Understanding the A2 Profile Barrel
Before delving into the upper receiver itself, it's crucial to understand the significance of the A2 profile barrel. This barrel profile is characterized by a thicker, heavier barrel that extends to the muzzle with a distinctive flash hider. This design offers several advantages:
- Improved Accuracy: The heavier profile helps to dissipate heat more effectively, leading to improved accuracy, especially during sustained firing. The added weight reduces barrel whip and vibrations.
- Enhanced Durability: The robust construction translates to increased durability and longevity, capable of withstanding significant use.
- Reduced Recoil: While not as dramatic as other recoil reduction methods, the added weight contributes to a slightly softer recoil impulse.
However, the A2 profile also presents some trade-offs:
- Increased Weight: This is arguably the most significant drawback. The heavier barrel increases the overall weight of the rifle, potentially impacting maneuverability and ease of carrying.
- Less Maneuverable: The added weight, combined with the length, can make the rifle less maneuverable in close-quarters situations.
The 20-Inch A2 Upper Receiver: A Detailed Look
A 20-inch A2 upper receiver typically incorporates the A2 profile barrel discussed above, along with a standard upper receiver featuring a forward assist and ejection port cover. This combination is often favored for:
- Long-Range Accuracy: The longer barrel provides increased velocity and improved accuracy at longer ranges, making it suitable for target shooting, hunting, or even some forms of competitive shooting.
- Increased Velocity: The longer barrel allows for the complete burning of the propellant, leading to higher muzzle velocity and a flatter trajectory.
- Reliability: The simplicity and robust design of the A2 platform translate to a highly reliable system.
Choosing the Right 20-Inch A2 Upper: Key Considerations
Selecting a 20-inch A2 upper involves several important considerations:
- Barrel Material: Common choices include chrome-moly steel (CM) and stainless steel. CM steel is typically more affordable, while stainless steel offers superior corrosion resistance.
- Gas System: Most 20-inch A2 uppers will employ a mid-length or carbine-length gas system. Mid-length systems are known for their balance of reliability and reduced recoil, while carbine-length systems are typically more compact.
- Manufacturer Reputation: Choosing a reputable manufacturer ensures quality and reliability. Research different brands and read reviews before making a purchase.
- Intended Use: Consider your intended use for the rifle. If it's primarily for long-range target shooting, accuracy should be a top priority. If it's for hunting, durability and reliability are equally important.
Conclusion: Is a 20-Inch A2 Upper Right for You?
A 20-inch A2 upper receiver presents a compelling option for shooters prioritizing long-range accuracy, reliability, and a classic AR-15 design. However, the added weight and reduced maneuverability should be carefully considered. Ultimately, the best choice depends on your individual needs and preferences. Carefully weighing the advantages and disadvantages, and considering the factors mentioned above, will help you determine if a 20-inch A2 upper is the right component for your next AR-15 build.
