Understanding 80% Lower Laws in 2024: A Guide to Federal Compliance

The single most important question for anyone interested in building a firearm is: “Is this legal?” The legality of 80% lowers and so-called “ghost gun kits” is a topic of intense debate and evolving regulation.

This guide will provide a clear, factual overview of the federal laws governing privately made firearms (PMFs) so you can proceed with confidence and in full compliance.

Disclaimer: This article is for informational purposes and is not legal advice. Laws change frequently. You are solely responsible for researching and complying with all current federal, state, and local laws.

 The Federal Position on 80% Kits

Under federal law, the act of building a firearm for your own personal use has historically been, and remains, legal for any individual who is not otherwise prohibited from possessing a firearm (e.g., a convicted felon).

The core of the issue revolves around the legal definition of a “firearm.” According to the ATF, only the receiver or frame is legally a “firearm.”

• What is an 80% Lower? An 80% lower receiver is a piece of metal or polymer that is not yet a receiver. It lacks the critical milling and drilling of the fire control cavity and pin holes. Because it is not yet a receiver, it is not federally regulated as a firearm and can be sold and shipped directly to the purchaser in most states without an FFL transfer.
• The “Readily Converted” Standard: Recent ATF rulings (such as Final Rule 2021R-05F) have focused on kits that are “readily converted” into a functional firearm. This has led to changes in how some kits are sold (e.g., jigs and lowers sold separately). The products sold on our website are structured to comply with these federal guidelines.

 Key Federal Rules to Know

1. Personal Use vs. Intent to Sell: It is federally legal to build a firearm for yourself. It is a federal crime to manufacture firearms with the intent to sell them without holding a Federal Firearms License (FFL).
2. Prohibited Persons: If you cannot legally purchase a firearm from a dealer, you cannot legally build or possess one either.
3. Serialization: At the federal level, you are not required to add a serial number to a firearm you build for personal use. However, some state and local laws do require serialization.

 The Critical Importance of State & Local Laws

This is the most important takeaway. While the federal government sets a baseline, individual states have enacted much stricter laws.

• States with Restrictions: States like California, New York, New Jersey, and others have passed laws that heavily regulate or ban the sale and possession of unfinished frames and receivers.
• Your Responsibility: Before you buy, you must do your due diligence. A simple search for “[Your State] 80% lower laws” is a good starting point. We also provide guidance on our [Internal Link: Educational Resources] page.

Building Responsibly

By selling only federally compliant kits and providing clear educational resources, we empower our customers to participate in this tradition lawfully. Knowledge and personal responsibility are the keys to ensuring the future of private firearm manufacturing.

Explore our selection of high-quality, federally compliant AR-15 and handgun kits.