Building a firearm is a rewarding experience for many enthusiasts, providing a deeper understanding of mechanics and firearms laws. One of the critical components in this journey is the 80 percent lower receiver. If you’re a beginner in the world of DIY firearms, here are eight essential facts to get you started on the right foot.
Contents
1. What is an 80 Percent Lower?
An 80 percent lower is an incomplete firearm receiver that requires additional machining to become a functional part of a firearm. Legally classified as a non-firearm, it allows hobbyists to build their own firearms without needing a Federal Firearms License (FFL). This designation stems from the fact that it is “80 percent” finished, meaning it has not yet reached the threshold required for it to function as a firearm.
2. Legal Considerations
In the United States, the legality of 80 percent lowers varies by state. Federal law does not regulate them as firearms, meaning they can be purchased without a background check. However, some states have imposed their own regulations, requiring registration or prohibiting their sale altogether. Before purchasing an 80 percent lower, always check your local laws to ensure compliance.
3. Machining Requirements
An 80 percent lower is not a “plug-and-play” solution. To complete it, users need to perform milling or drilling operations to create the necessary fire control group housing and ensure compatibility with the upper receiver. Depending on your skill level and tool availability, this can be done using hand tools like a drill press or specialized equipment like a CNC machine. Beginners may want to start with a simpler design to build their confidence.
Reputable Manufacturers to Consider
When building 80 percent lower AR-15, opting for parts from reputable manufacturers can ensure you receive a quality product. Here are some well-known brands that consistently deliver high-quality AR-15 uppers:
- Aero Precision: Known for their affordable yet high-quality parts, Aero Precision offers excellent options for both beginner and advanced builders.
- Daniel Defense: A premium manufacturer, Daniel Defense is recognized for their exceptional craftsmanship, durability, and accuracy.
- Palmetto State Armory: They provide a wide range of AR-15 components and are known for their affordability without compromising quality.
- BCM (Bravo Company Manufacturing): Renowned for their reliability and attention to detail, BCM products are favored by law enforcement and military personnel.
- Noveske Rifleworks: Although on the higher end of the price spectrum, Noveske is known for precision engineering and superior performance.
4. Tools You’ll Need
Completing an 80 percent lower requires specific tools. Basic tools include:
- Drill Press: For precise drilling of holes.
- End Mills: For machining out the fire control group pocket.
- Calipers: For accurate measurement.
- Router: For finishing edges and achieving proper depth.
Investing in quality tools is essential, as poor equipment can lead to mistakes and potentially render the lower unusable.
5. Understanding the Parts
To build a functional firearm, you’ll need to be familiar with all the components that fit into the lower receiver. This includes:
- Trigger
- Hammer
- Safety Selector
- Pistol Grip
- Stock
Understanding these parts and how they interact is crucial for successful assembly and function.
6. Assembly Process
Once you have completed the machining process, the next step is assembly. This involves carefully following a guide or manual specific to your firearm type. Many online resources and videos can assist first-time builders in making sure each component is properly installed. Take your time, verify each step, and ensure everything is aligned correctly to avoid issues down the line.
7. Importance of Safety
Safety should always be the top priority when working with firearms. Whether you’re machining or assembling a firearm, following best practices is crucial. Always wear safety goggles, work in a well-ventilated area, and keep tools organized to minimize accidents. Additionally, understand how to safely handle a firearm once it is completed, including proper storage and transportation.
8. The Community and Resources
Many online forums, social media groups, and local clubs cater to DIY firearm builders. These communities are invaluable resources for beginners. They offer support, advice, and a space to share your progress and challenges. Engaging with experienced builders can help you overcome obstacles and enhance your skills, making the overall process more enjoyable.
Conclusion
Building a firearm using an 80 percent lower can be an incredibly fulfilling endeavor. However, it requires a thorough understanding of the legal, technical, and safety aspects involved. By familiarizing yourself with these eight key facts, you can streamline your journey, from purchasing your components to assembling your first firearm. Always prioritize safety, respect the laws in your area, and don’t hesitate to reach out to the community for support. Happy building!