The DPMS 308 complete upper is a popular choice for building or upgrading AR-10 platform rifles chambered in .308 Winchester (7.62x51mm NATO). This guide will delve into the features, benefits, and considerations surrounding this specific upper receiver group. We'll explore what makes it a desirable option for both experienced shooters and those new to the AR-10 platform.
Understanding the DPMS Pattern
Before diving into the specifics of the complete upper, it's crucial to understand the DPMS pattern. Unlike the more common AR-15 pattern, the AR-10 platform boasts several variations, with DPMS being one of the prominent ones. This means that DPMS pattern uppers and lowers are not directly interchangeable with other AR-10 patterns like Armalite or LMT. Compatibility is key, so always ensure your lower receiver is compatible with the DPMS pattern before purchasing a complete upper.
Key Features of a DPMS 308 Complete Upper
A DPMS 308 complete upper typically includes the following components:
- Upper Receiver: The main body of the upper, housing the bolt carrier group and other internal components. DPMS uppers are generally known for their robust construction.
- Bolt Carrier Group (BCG): The heart of the system, responsible for cycling the action. The quality of the BCG significantly impacts reliability and longevity.
- Barrel: Usually a heavy profile barrel for improved accuracy and reduced recoil in the .308 Winchester caliber. Barrel length varies, with common options including 16", 18", and 20" inches. Look for specifications regarding barrel twist rate (e.g., 1:10 or 1:11) as this affects bullet stability.
- Gas System: The gas system regulates the amount of gas channeled from the barrel to cycle the action. Different gas systems (e.g., direct impingement, piston) offer varying advantages and disadvantages.
- Handguard/Rail System: Provides a mounting platform for accessories such as optics, lights, and grips. Materials and lengths vary considerably. Consider the length and rail system type (e.g., M-LOK, KeyMod) based on your needs.
- Charging Handle: Used to manually cycle the bolt. Some uppers come with ambidextrous charging handles for increased versatility.
- Forward Assist: Aids in chambering a round if needed.
- Ejection Port Cover: Protects the ejection port from debris.
Benefits of Choosing a DPMS 308 Complete Upper
- Convenience: Purchasing a complete upper simplifies the build process significantly, eliminating the need to source individual components.
- Compatibility: Provided it matches your lower receiver's pattern, installation is typically straightforward.
- Pre-tested components: Reputable manufacturers ensure the components are matched and function correctly together.
- Cost-effectiveness: Buying a complete upper can sometimes be more cost-effective than purchasing individual components separately.
Considerations Before Purchasing
- Barrel Length: Shorter barrels are lighter and more maneuverable but might sacrifice some accuracy and velocity. Longer barrels offer improved accuracy and velocity but add weight.
- Gas System: Direct impingement systems are simpler and lighter but can lead to more fouling. Piston systems are cleaner but are typically more expensive and heavier.
- Rail System Length and Type: Choose a rail system length appropriate for your accessories and preferred shooting style. M-LOK and KeyMod systems offer lighter weight and modularity compared to Picatinny rails.
- Manufacturer Reputation: Research the manufacturer's reputation for quality and reliability before purchasing.
Conclusion
The DPMS 308 complete upper offers a convenient and often cost-effective way to build or upgrade an AR-10 platform rifle. By carefully considering the features, benefits, and compatibility aspects discussed above, you can select an upper that meets your specific needs and performance expectations. Remember to always prioritize safety and proper firearm handling techniques.
