The Ultimate Guide to 80 Percent Lowers: Your Pathway to Custom Firearms

In the world of firearms, customization is key. Enthusiasts and builders alike are continually seeking ways to create firearms that are uniquely theirs. One of the most popular avenues for achieving this level of personalization is through the use of an 80 percent lower. At, we understand the allure of crafting your own firearm and the satisfaction that comes from building something with your own hands. This guide will explore everything you need to know about 80 percent lowers, and why they are a perfect choice for your next build.

What is an 80 Percent Lower?

An 80 percent lower is a partially completed firearm receiver. It is called “80 percent” because it is roughly 80 percent finished, with the remaining 20 percent requiring additional machining to become a fully functional lower receiver. This unfinished state classifies it as a non-firearm, allowing enthusiasts to purchase and complete it without the need for federal licensing or serialization.

Legal Considerations

One of the most appealing aspects of an 80 percent lower is the legal freedom it offers. Because it is not considered a firearm until it is completed, you can purchase an 80 percent lower from without going through the traditional background checks or waiting periods required for buying a fully finished lower receiver. However, it is crucial to stay informed about local and state laws, as regulations can vary significantly.

Why Choose an 80 Percent Lower?

  1. Customization: Building your own firearm from an 80 percent lower allows for unparalleled customization. You can select every component, from the trigger to the barrel, to create a firearm that perfectly suits your preferences and needs.
  2. Cost-Effective: Purchasing an 80 percent lower from can be more cost-effective than buying a complete firearm. You can spread out the cost over time as you acquire parts and tools.
  3. Skill Development: Completing an 80 percent lower is a fantastic way to develop and hone your machining and gunsmithing skills. The process is educational and rewarding, providing a deep understanding of firearm mechanics.
  4. Privacy: For those who value privacy, building a firearm from an 80 percent lower can be done without the same level of scrutiny and record-keeping associated with purchasing a complete firearm.

The Building Process

Building a firearm from an 80 percent lower requires a few essential tools and a bit of know-how. Here’s a step-by-step overview to get you started:

  1. Choose Your 80 Percent Lower: Begin by selecting the right 80 percent lower for your build. At, we offer a variety of options to suit different firearm platforms.
  2. Gather Tools and Jigs: You’ll need a set of tools and jigs specifically designed for finishing an 80 percent lower. These typically include a drill press or milling machine, a jig kit, and various drill bits and end mills.
  3. Machining the Lower: Secure the 80 percent lower in the jig and follow the provided instructions to mill out the necessary cavities and holes. This step requires precision and patience, as it transforms the 80 percent lower into a functional receiver.
  4. Assembly: Once the machining is complete, you can begin assembling your firearm. This involves installing the lower parts kit, the trigger group, the buffer tube, and the stock. Follow manufacturer instructions for each component to ensure proper assembly.
  5. Testing and Finishing: After assembly, it’s essential to test your firearm to ensure it functions correctly. You may also choose to apply a finish to your lower receiver for added durability and aesthetics.

Common Questions About 80 Percent Lowers

Are 80 Percent Lowers Legal?

Yes, 80 percent lowers are legal to purchase and complete at the federal level. However, it’s important to check your local and state laws, as some jurisdictions have additional restrictions.

Do I Need a Serial Number for My Completed Lower?

At the federal level, a serial number is not required for a firearm built for personal use. However, some states may have different requirements, so it’s essential to be aware of your local regulations.

Can I Sell a Firearm Built from an 80 Percent Lower?

Generally, firearms built from an 80 percent lower are intended for personal use. Selling a completed firearm may require compliance with federal and state laws, including serialization and background checks.

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Choosing the Right 80 Percent Lower

At, we offer a wide range of 80 percent lowers to suit different needs and preferences. Whether you’re building an AR-15, AR-10, or another platform, we have the perfect 80 percent lower for you. Our products are crafted from high-quality materials to ensure durability and performance.


Building a firearm from an 80 percent lower is a rewarding experience that offers unmatched customization, cost savings, and skill development. At, we are dedicated to providing top-quality 80 percent lowers and the resources you need to complete your build successfully. Explore our selection today and start your journey toward creating a firearm that is uniquely yours.

Embrace the freedom and satisfaction that comes with building your own firearm. With an 80 percent lower from, the possibilities are endless.

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