Understanding 80% Lowers: The Perfect Foundation for Custom Firearms

Building custom firearms has become increasingly popular among gun enthusiasts, and at the heart of this trend is the 80% lower. An 80% lower is an unfinished lower receiver, meaning it requires additional machining and assembly before it becomes a fully functional firearm. This concept allows hobbyists and gunsmiths to create personalized firearms tailored to their specific needs and preferences. At, we specialize in providing high-quality 80% lowers that serve as the perfect foundation for your custom firearm projects.

What is an 80% Lower?

An 80% lower receiver is a partially completed lower receiver that has not reached the stage of being classified as a firearm by the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF). Essentially, it is 80% finished, hence the name. This remaining 20% of work typically involves milling out the fire control group pocket, drilling the trigger pin, hammer pin, and safety selector holes. Since it is not considered a firearm, an 80% lower can be purchased and shipped directly to your doorstep without the need for a Federal Firearms License (FFL).

The Appeal of 80% Lowers

The primary appeal of 80% lowers lies in the freedom and flexibility they offer gun enthusiasts. By starting with an 80% lower, you can create a custom firearm that meets your exact specifications. Whether you are looking to build a rifle for hunting, a pistol for self-defense, or a specialized firearm for competition shooting, an 80% lower score gives you the foundation to achieve your goals.

Legal Considerations

One of the most significant advantages of 80% lower is the legal aspect. Since an 80% lower is not classified as a firearm, it does not require serialization or registration under federal law. This allows for a level of privacy and autonomy in firearm ownership that is highly valued by many gun enthusiasts. However, it is essential to stay informed about state and local laws, as regulations can vary. At, we encourage all our customers to familiarize themselves with the legal requirements in their respective jurisdictions before purchasing and completing an 80% lower.

The Machining Process

Completing an 80% lower involves a few critical steps, and having the right tools and equipment is essential. The process typically requires a milling machine or a drill press, along with a jig designed specifically for 80% lowers. At, we offer comprehensive kits that include the necessary tools and instructions to guide you through the process. Here is a brief overview of the steps involved:

  1. Securing the Lower: Using the jig, securely mount the 80% lower to ensure stability during the machining process.
  2. Milling the Fire Control Pocket: Carefully mill out the fire control group pocket to the required depth and dimensions.
  3. Drilling Pin Holes: Drill the trigger pin, hammer pin, and safety selector holes with precision.
  4. Finishing Touches: Once the machining is complete, deburr and smooth the edges for a professional finish.

Customization Options

One of the most exciting aspects of working with 80% lower is the opportunity for customization. From choosing the material—whether aluminum, polymer, or other alloys—to selecting the finish and color, the possibilities are endless. At, we offer a wide range of 80% lowers to suit every preference. You can opt for different designs, engravings, and even personalized markings to make your firearm truly unique.

Building a Community

At, we believe that building custom firearms is not just a hobby but a way to foster a community of like-minded individuals. Our customers often share their builds, tips, and experiences, creating a supportive and informative network. Whether you are a seasoned gunsmith or a beginner, the community is here to help you every step of the way.

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Quality and Reliability

When it comes to 80% lowers, quality and reliability are paramount. At, we are committed to providing products that meet the highest standards. Our 80% lowers are precision-engineered and thoroughly tested to ensure durability and performance. We understand that your custom firearm project is an investment, and we strive to deliver products that you can trust.

Getting Started

If you are new to the world of 80% lower, getting started can seem daunting. However, with the right resources and guidance, the process can be incredibly rewarding. At, we offer a wealth of information, including step-by-step guides, video tutorials, and customer support to assist you in your journey. Our goal is to make the experience as smooth and enjoyable as possible, ensuring that you have the knowledge and confidence to complete your 80% lower successfully.


The world of 80% lowers opens up a realm of possibilities for gun enthusiasts, offering a unique blend of customization, legal flexibility, and community support. At, we are proud to be at the forefront of this exciting movement, providing high-quality 80% lowers and the resources needed to bring your custom firearm projects to life. Whether you are building your first firearm or adding to your collection, is your trusted partner in creating the perfect custom firearm. Embrace the freedom, creativity, and satisfaction that comes with working on 80% lowers, and let us help you turn your vision into reality.

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