Understanding the 80% Lower: A Comprehensive Guide

In recent years, the popularity of the 80% lower has surged among firearm enthusiasts, hobbyists, and DIY gunsmiths. An 80% lower receiver is a partially completed piece of aluminum or polymer that requires additional machining to be turned into a fully functional firearm receiver. At, we specialize in providing high-quality 80% lowers that empower you to build your firearm while complying with federal regulations.

What is an 80% Lower?

An 80% lower is a firearm receiver that is only 80% completed. It lacks the final machining that would allow it to function as a firearm. Because it is not yet a firearm by legal standards, it can be purchased and owned without a background check or serialization, making it an appealing option for many. However, it’s crucial to note that once the lower is completed and made functional, it must comply with all federal, state, and local firearm laws.

The Benefits of Using an 80% Lower

There are several advantages to using an 80% lower for your firearm builds:

  1. Customization: With an 80% lower, you have complete control over the final specifications of your firearm. This allows for a high degree of customization in terms of aesthetics and functionality.
  2. Privacy: Since an 80% lower is not considered a firearm, it does not require serialization or background checks. This provides a level of privacy for those who prefer it.
  3. Cost-Effective: Building a firearm from an 80% lower cost can be more cost-effective than purchasing a complete firearm, especially if you already have some of the necessary tools.
  4. Educational: For those interested in the mechanics of firearms, working on an 80% lower is an educational and rewarding experience.

Legal Considerations

At, we emphasize the importance of understanding the legal implications of completing an 80% lower. While purchasing and owning an 80% lower is legal at the federal level, the regulations can vary significantly by state. It’s essential to research and comply with all local laws before beginning your project. Additionally, once the lower is completed, it becomes a firearm and must adhere to all applicable firearm regulations, including serialization and background checks if required by your jurisdiction.

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The Process of Completing an 80% Lower

Completing an 80% lower involves several steps and requires specific tools and skills. Here’s a basic outline of the process:

  1. Preparation: Gather all necessary tools, including a jig, drill press or milling machine, and finishing tools. Ensure you have safety equipment like gloves and eye protection.
  2. Milling the Receiver: Using the jig as a guide, mill out the remaining 20% of the lower receiver. This typically involves cutting out the fire control group pocket and drilling the trigger pin, hammer pin, and safety selector holes.
  3. Finishing Touches: After the machining is complete, clean up the receiver by deburring any rough edges and ensuring all holes are properly aligned and finished.
  4. Assembling the Firearm: Once the lower receiver is complete, you can assemble it with the upper receiver and other components to create a fully functional firearm.

Tools and Kits Available at

At, we offer a wide range of tools and kits to help you complete your 80% lower with ease and precision. Our products are designed to cater to both beginners and experienced builders, ensuring that you have everything you need to successfully complete your project.

The Community of 80% Lower Builders

Building a firearm from an 80% lower is more than just a project; it’s a community. Enthusiasts from all walks of life share their experiences, tips, and builds online, creating a supportive network for new and experienced builders alike. At, we’re proud to be a part of this community, providing resources and support to help you every step of the way.

Why Choose

When it comes to purchasing an 80% lower, quality and reliability are paramount. At, we are committed to providing our customers with the best products and services. Here are a few reasons why you should choose us:

  1. Quality Assurance: Our 80% lowers are manufactured to the highest standards, ensuring durability and precision.
  2. Comprehensive Support: We offer detailed guides, customer support, and a wealth of resources to assist you in completing your 80% lower.
  3. Wide Selection: Our extensive inventory includes a variety of 80% lowers, jigs, and finishing kits to suit your specific needs.
  4. Customer Satisfaction: At, customer satisfaction is our top priority. We strive to provide an exceptional shopping experience and stand behind the quality of our products.


The journey of building a firearm from an 80% lower is a unique and rewarding experience. It offers a blend of customization, privacy, and education that appeals to many firearm enthusiasts. At, we are dedicated to providing you with the highest quality 80% lowers and the support you need to complete your build successfully. Whether you are a seasoned gunsmith or a first-time builder, our products and resources are designed to help you achieve your goals. Explore our website today and start your journey with

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