Finding the right upper receiver is crucial for building a reliable and accurate AR-15. The 20-inch A2 upper receiver, a classic design, remains a popular choice for many shooters. This comprehensive guide delves into the specifics of this configuration, examining its features, advantages, and potential drawbacks to help you determine if it's the right choice for your needs.
Understanding the A2 Profile Barrel
The heart of the 20-inch A2 upper lies in its barrel. The A2 profile is characterized by its heavier weight and thicker profile compared to more modern designs like the lightweight or mid-length profiles. This added weight offers several key benefits:
- Increased barrel rigidity: The thicker profile reduces barrel whip, improving accuracy, especially during sustained fire.
- Enhanced heat dissipation: The larger surface area facilitates better heat dissipation, allowing for more sustained firing without significant accuracy degradation.
- Improved durability: The robust construction makes it highly resistant to wear and tear, extending the barrel's lifespan.
However, the A2 profile's heavier weight can impact the overall balance and maneuverability of the rifle, potentially making it less suitable for dynamic shooting situations.
Advantages of a 20-Inch Barrel
The extended 20-inch barrel length provides several advantages:
- Increased velocity: Longer barrels allow for more complete propellant burn, resulting in higher muzzle velocity and increased range.
- Flatter trajectory: The higher velocity translates to a flatter trajectory, making long-range shots easier to predict and compensate for.
- Improved accuracy: The combination of longer barrel and A2 profile contributes to enhanced accuracy, particularly at longer ranges.
These advantages make the 20-inch A2 upper ideal for applications requiring long-range precision, such as target shooting or hunting.
Disadvantages of a 20-Inch Barrel
While offering several benefits, a 20-inch barrel also presents some drawbacks:
- Increased weight and length: The longer barrel significantly increases the overall weight and length of the rifle, impacting maneuverability and portability. This can be a significant factor for those who need a more compact or lightweight setup.
- Reduced maneuverability: The increased length and weight can make it more challenging to maneuver in close-quarters or confined spaces.
- Potential for inconvenience: The longer barrel can be cumbersome during transport and storage.
Beyond the Barrel: Other Considerations
While the barrel is the defining feature, several other aspects contribute to the overall performance of a 20-inch A2 upper:
- Upper receiver material: Most are made from forged 7075-T6 aluminum, known for its strength and durability. However, some manufacturers offer options in other materials like billet aluminum.
- Gas system: The 20-inch A2 upper typically utilizes a standard carbine-length gas system, but this may vary depending on the manufacturer. This system influences the rifle's recoil impulse and cycling reliability.
- Handguard: A traditional A2 handguard is usually included and provides a basic platform for accessories. Many users opt to upgrade to a free-floating handguard for improved accuracy.
- Sights: The A2 upper frequently includes a fixed A2 rear sight and a front sight post, though some may not.
Conclusion: Is a 20-Inch A2 Upper Right for You?
The 20-inch A2 upper receiver remains a relevant option for those prioritizing accuracy and range. Its heavy barrel provides excellent stability and heat dissipation, beneficial for target shooting and hunting. However, its increased weight and length should be carefully considered against the needs and preferences of the user. It's not the best choice for close-quarters combat or situations requiring maneuverability. Thoroughly weigh the advantages and disadvantages before purchasing to ensure it aligns with your specific needs and intended application.
Disclaimer: This information is for educational purposes only and should not be considered professional advice. Always handle firearms responsibly and follow all applicable laws and regulations.
