AR-15 Complete Uppers: A Comprehensive Guide
When it comes to the AR-15 platform, the upper receiver is one of the most crucial components. It’s the part that houses the barrel, bolt carrier group, and the action of the firearm. In this article, we’ll delve into the details of AR-15 complete uppers, covering their construction, materials, features, and how to choose the right one for your needs.
Construction and Materials
The construction of an AR-15 upper receiver is typically made from either aluminum or steel. Aluminum receivers are lighter and more durable, while steel receivers offer increased strength and longevity. Here’s a breakdown of the materials commonly used:
| Material | Description |
|---|---|
| Aluminum | Aluminum receivers are lightweight and have good corrosion resistance. They are commonly made from 7075-T6 aluminum, which is known for its strength and durability. |
| Steel | Steel receivers are heavier and offer increased strength. They are typically made from 4140 or 4160 steel, which provides excellent wear resistance and toughness. |
Additionally, some uppers may feature a hardcoat anodized finish, which improves corrosion resistance and provides a durable surface that resists scratches and wear.
Features to Consider
When selecting an AR-15 complete upper, there are several features to consider to ensure it meets your specific needs:
- Caliber: The caliber of your upper receiver will determine the type of ammunition it can fire. Common calibers include 5.56mm, .223 Remington, 6.5 Grendel, and .300 Blackout.
- Barrel Length: Barrel length affects the velocity, accuracy, and weight of the firearm. Common barrel lengths include 16″, 18″, and 20″ for rifles, and 10.5″ and 11.5″ for carbines.
- Barrel Profile: The barrel profile determines the weight and balance of the firearm. Common profiles include lightweight, medium, and heavy.
- Barrel Twist Rate: The twist rate affects the stability and accuracy of the bullet. Common twist rates include 1:7, 1:8, and 1:9 for 5.56mm and .223 Remington rounds.
- Handguard: The handguard provides a secure grip and protects the barrel. Common handguard materials include aluminum, polymer, and carbon fiber.
- Gas System: The gas system determines the amount of gas that is bled into the action, affecting the cyclic rate of the firearm. Common gas systems include carbine, mid-length, and full-length.
- Chamber and Bolt Face: The chamber and bolt face determine the type of ammunition the firearm can fire. Common options include 5.56mm, .223 Remington, 6.5 Grendel, and .300 Blackout.
Choosing the Right Upper
When choosing an AR-15 complete upper, consider the following factors:
- Intended Use: Determine whether you’ll be using the firearm for hunting, competition, or recreational shooting. This will help you select the appropriate caliber, barrel length, and features.
- Weight: Consider the weight of the upper receiver, as it will affect the overall weight of the firearm. A lighter upper receiver will make the firearm easier to carry and maneuver.
- Quality: Invest in a high-quality upper receiver from a reputable manufacturer. This will ensure that the firearm is reliable and durable.
- Customization: If you plan to customize your firearm, choose an upper receiver that allows for easy modifications and upgrades.
Some popular AR-15 complete uppers include the Colt M4, Daniel Defense M4, and Smith & Wesson M&P15 Sport II. These uppers are known for their quality, reliability, and performance.
Conclusion
AR-15 complete uppers are essential components of the AR-15 platform.
