The Palmetto State Armory (PSA) 20-inch upper receiver is a popular choice among AR-15 builders and enthusiasts seeking a longer barrel for increased accuracy and range. This comprehensive guide delves into the features, benefits, and considerations of using a PSA 20-inch upper in your build. We'll explore various models, potential applications, and what to expect from this particular configuration.
Understanding the Advantages of a 20-Inch Barrel
A 20-inch barrel offers several key advantages over shorter barrel lengths, making it ideal for specific applications:
- Increased Accuracy: The longer barrel allows for more complete powder burn, leading to higher velocity and improved accuracy at longer ranges. This is particularly beneficial for precision shooting and target practice.
- Greater Velocity: The extended barrel translates to a significant increase in muzzle velocity, which extends effective range and reduces bullet drop.
- Flatter Trajectory: Higher velocity contributes to a flatter trajectory, making long-range shots easier to predict and adjust for.
- Reduced Recoil (Generally): While not always noticeable, the added weight of a longer barrel can subtly mitigate felt recoil.
PSA 20-Inch Upper Variations and Considerations
PSA offers various 20-inch upper receivers, each with its own specifications and features. Key considerations when choosing include:
- Profile: Different barrel profiles (e.g., government profile, pencil profile, mid-length profile) influence weight, heat dissipation, and handling characteristics. A heavier profile generally improves accuracy but increases weight.
- Gas System: The gas system (e.g., carbine-length, mid-length) affects how the gas is channeled to cycle the action. Mid-length gas systems are often favored for their balance between reliability and reduced recoil.
- Finish: Various finishes (e.g., parkerized, hard chrome) impact durability and corrosion resistance.
- Handguard: The handguard plays a significant role in ergonomics and accessory mounting capabilities. PSA offers various options, including M-LOK and KeyMod compatible handguards.
Note: Always check PSA's official website for the most up-to-date specifications and available configurations.
Applications for a PSA 20-Inch Upper
The PSA 20-inch upper is well-suited for various applications:
- Long-Range Shooting: The extended barrel and increased accuracy are perfect for target practice at longer distances.
- Hunting: The enhanced accuracy and velocity are beneficial for hunting applications, especially when engaging targets at longer ranges.
- Competition Shooting: Some precision-based shooting competitions favor longer barrels for increased accuracy.
- Law Enforcement/Military (Specific Roles): Longer barrels can be advantageous in specific military or law enforcement roles requiring long-range precision.
Building Your AR-15 with a PSA 20-Inch Upper
When building your AR-15 with a PSA 20-inch upper, ensuring proper compatibility with your lower receiver and other components is crucial. Consult reputable AR-15 building guides and resources to ensure a safe and functional build. Pay close attention to the gas system length to match it to your chosen buffer system for optimal reliability.
Conclusion
The PSA 20-inch upper receiver presents a compelling option for AR-15 builders seeking enhanced accuracy and range. Understanding the various configurations and their implications is crucial for selecting the right upper for your specific needs and application. Remember to always prioritize safety and follow best practices when assembling your AR-15. This guide provides a solid foundation, but further research and consultation with experienced AR-15 builders are always recommended.
