The 6.8 SPC (6.8mm Special Purpose Cartridge) has gained significant popularity among shooters seeking a powerful and versatile intermediate cartridge. Its increased stopping power and flatter trajectory compared to the 5.56 NATO make it a compelling choice for hunting, home defense, and three-gun competitions. Finding the right 6.8 SPC upper receiver can be a crucial step in building a customized AR-15 platform. This guide will help you navigate the market and choose the perfect upper for your needs.
Understanding 6.8 SPC Uppers
Before diving into specifics, it’s vital to understand what constitutes a 6.8 SPC upper. Unlike a complete AR-15 rifle, the upper receiver is the top half of the firearm, containing the barrel, bolt carrier group, charging handle, and forward assist. Purchasing an upper allows for greater customization, enabling you to tailor your AR-15 to your specific requirements, whether it's a lightweight hunting rifle or a heavy-barreled competition gun.
Key Features to Consider When Buying a 6.8 SPC Upper
Several factors will influence your decision when buying a 6.8 SPC upper receiver. Consider these key aspects:
1. Barrel Length and Profile:
- Length: Barrel length impacts accuracy, velocity, and overall weight. Shorter barrels (e.g., 10.5"-16") are lighter and more maneuverable, ideal for close-quarters situations or hunting in dense brush. Longer barrels (e.g., 18"-20") offer improved accuracy and velocity, making them better suited for longer-range shooting.
- Profile: Barrel profiles (e.g., government profile, lightweight profile, mid-length profile) affect weight, heat dissipation, and rigidity. Heavier profiles offer better accuracy and reduce vibrations, while lighter profiles enhance maneuverability.
2. Gas System:
The gas system regulates the amount of gas that cycles the bolt. Common options include:
- Carbine-length gas system: Generally suitable for shorter barrels, offering a quicker cycling rate.
- Mid-length gas system: Provides a balance between reliability and reduced recoil, often preferred for longer barrels.
- Pistol-length gas system: Typically used with shorter barrels, known for its snappy recoil impulse.
3. Handguard:
The handguard protects your hand from the hot barrel and offers mounting points for accessories like lights, lasers, and optics. Materials range from lightweight aluminum to durable polymer. Consider the length, material, and mounting system (e.g., M-LOK, KeyMod) when selecting a handguard.
4. Bolt Carrier Group (BCG):
The BCG is a critical component that cycles the action. High-quality BCGs are made from durable materials and are precisely manufactured for reliable function. Look for BCGs made from chrome-lined steel for enhanced durability and resistance to corrosion.
5. Upper Receiver Material:
Uppers are typically made from 7075-T6 aluminum, known for its strength and lightweight properties. Ensure the upper receiver is properly machined and finished to ensure a tight fit with your lower receiver.
Finding 6.8 SPC Uppers for Sale
Numerous reputable manufacturers produce high-quality 6.8 SPC uppers. Research different brands, compare prices and features, and read user reviews before making a purchase. Remember to factor in the cost of additional components like sights, optics, and accessories.
Conclusion
Choosing the right 6.8 SPC upper receiver requires careful consideration of individual needs and preferences. By understanding the key features and conducting thorough research, you can find the perfect upper to build a customized AR-15 platform that meets your specific requirements for accuracy, reliability, and performance. Remember to always prioritize safety and adhere to all applicable laws and regulations.
