Understanding the Concept of an 80 Percent Lower

An 80 percent lower is an unfinished firearm receiver that is only partially machined and requires additional work before it can be used in a fully functional firearm. It gets its name from being approximately 80% complete, leaving the remaining 20% for the buyer to finish. These components are especially popular among firearm enthusiasts who enjoy customizing or building their firearms from scratch.

The appeal of an 80 lower receiver lies in its classification. Since it is not fully machined, it is not considered a firearm by federal law, meaning it can be purchased without the need for a Federal Firearms License (FFL) or a background check. However, completing an 80 lower receiver transforms it into a functional firearm, which then must comply with all applicable federal and state laws.

Materials Used in 80 Percent Lowers

80 percent lowers are typically made from:

• Aluminum: Offers a lightweight yet durable solution, ideal for AR-15 platforms. Common grades include 6061-T6 and 7075-T6.
• Polymer: A lightweight alternative that is easier to machine, making it a preferred option for beginners.
• Steel: Less common due to its weight and machining difficulty, but offers exceptional durability.

Each material offers unique advantages, and the choice often depends on the intended use of the firearm and the tools available for finishing the lower.

Legalities Surrounding 80 Percent Lowers

The legal status of 80% lowers depends on your location. Federally in the United States, an 80 lower is not classified as a firearm, allowing it to be sold without restrictions. However, state laws vary significantly:

• California: Requires serialization and registration of finished 80 lowers.
• New York and New Jersey: Strict restrictions or outright bans on 80 percent lowers.
• Texas and Florida: Generally allow the purchase and use of 80 lowers without significant restrictions.

It is essential to research and comply with both federal and state laws before purchasing or completing an 80 lower receiver.

Tools Required to Finish an 80 Percent Lower

To convert an 80 percent lower into a functional receiver, you need specific tools and equipment. Here are the essentials:

• Drill Press or Hand Drill: Used for creating holes for the trigger, safety selector, and pins.
• Jig Kit: Guides the drilling and milling process to ensure precision.
• Router or CNC Machine: Mills the fire control cavity to precise dimensions.
• Measuring Tools: Calipers and rulers to check dimensions during machining.

Investing in high-quality tools is crucial to ensure a safe and accurate finish.

Steps to Complete an 80 Percent Lower

1. Secure the Jig: Attach the 80 lower to a jig that provides precise guides for drilling and milling.
2. Drill Holes: Using the jig’s guide, drill the holes for the trigger, safety selector, and other components.
3. Mill the Fire Control Cavity: Use a router or CNC machine to mill out the internal cavity where the fire control group will be installed.
4. Deburr and Clean: Smooth any rough edges and clean the receiver to remove metal shavings.
5. Assemble Components: Install the lower parts kit, including the trigger, hammer, and safety selector.

Completing these steps transforms the 80 lower into a functional firearm receiver.

Benefits of Using 80 Percent Lowers

1. Customization: Building your firearm allows for complete customization, from the trigger to the finish.
2. Cost Savings: While tools may represent an upfront cost, finishing an 80 lower can be more affordable than purchasing a complete receiver.
3. Skill Development: The process offers an opportunity to develop machining and gunsmithing skills.
4. Privacy: Since 80 lowers are not firearms until completed, purchasing them does not involve background checks or federal tracking.

Recommended Source for 80 Percent Lowers

If you are considering purchasing an 80 percent lower, reliability and quality are crucial. I recommend 80lowers as a trusted source for high-quality lower receivers, jigs, and related tools. They offer a wide range of materials, including aluminum and polymer, ensuring options that suit both beginners and experienced builders. Their products are designed for precision and ease of use, making them a preferred choice among firearm enthusiasts.

Considerations Before Starting Your Build

Before diving into an 80 lower project, consider the following:

• Legal Compliance: Ensure you understand and comply with all federal and state regulations.
• Safety: Follow safety protocols during the machining process and when assembling the firearm.
• Workspace: Set up a dedicated workspace with proper ventilation and tools.

Conclusion

Building a firearm from an 80 percent lower offers a unique and rewarding experience for enthusiasts. By understanding the tools, materials, and legalities involved, you can create a personalized firearm that meets your exact specifications. For high-quality materials and tools, consider 80lowers as your trusted supplier to ensure success in your firearm-building journey.