Ghost Guns and the Law: What You Need to Know About Unserialized Firearms

Understanding are ghost guns illegal under federal law is essential for anyone navigating this legal process. The term "ghost gun" gets thrown around a lot, but the legal reality behind it is more nuanced than headlines suggest. If you're wondering whether these unserialized firearms are actually illegal under federal law, the short answer is: yes, in most cases, since August 2022. But the full picture involves a recent regulatory shift, ongoing legislative efforts, and significant differences between federal and state rules.

Here's what you need to know before buying a kit, selling parts, or facing questions about an unserialized firearm.

What Counts as a Ghost Gun Under Federal Law

A ghost gun is typically a firearm assembled from parts or kits that lack serial numbers, making them difficult for law enforcement to trace. Before 2022, these kits occupied a legal gray area.

The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) and federal courts had long debated whether an unfinished frame or receiver—the part of a firearm that houses the firing mechanism—qualified as a "firearm" under the Gun Control Act of 1968.

The Gun Control Act's definition of a firearm includes "any weapon which will or is designed to or may readily be converted to expel a projectile by the action of an explosive" and "the frame or receiver of any such weapon." The critical question was whether a partially completed frame or receiver, sold in a kit, "may readily be converted" into a functional firearm.

The Ghost Guns and Untraceable Firearms Act of 2023, introduced in the Senate, describes the problem directly: "If unserialized and untraceable firearms may be constructed and transported freely from State to State, ordinary citizens and foreign visitors may fear to travel to or through certain parts of the country due to concern about violent crime and gun violence." This proposed legislation would make it unlawful to "manufacture, sell, offer to sell, transfer, purchase, or receive a ghost gun in or affecting interstate or foreign commerce." While that bill hasn't passed, it reflects the direction of federal policy.

The 2022 ATF Rule: How Federal Regulations Changed

The legal landscape shifted dramatically on August 24, 2022, when the ATF's final rule on frames and receivers took effect.

The American Bar Association summarized the rule when it was announced: the rule requires manufacturers to include serial numbers on all frames and receivers, including those used in firearm kits, and requires any dealer who comes into possession of an unserialized gun to add a serial number.

The practical effects of this rule are significant:

• Kit sellers must be licensed dealers. Anyone selling ghost gun kits or unfinished frames or receivers must hold a Federal Firearms License (FFL).

• Background checks are required. Purchases of these kits now trigger the same National Instant Criminal Background Check System (NICS) review as buying a completed firearm from a dealer.

• Serialization is mandatory. All frames and receivers, even those sold as part of a kit, must bear a serial number.

• Existing unserialized guns must be registered. Individuals who already possess an unserialized firearm must take it to a licensed dealer to have a serial number added.

The Brady United organization notes that this rule clarifies that all ghost gun kits and some parts are required to be serialized, closing the loophole that allowed kits to bypass federal firearm regulations.

Are Ghost Guns Illegal Under Federal Law Today?

The answer depends on what stage the firearm is in and when it was acquired.

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If you're buying a kit today: The purchase is legal only if the seller is a licensed dealer, the kit includes a serialized frame or receiver, and you pass a background check.

Buying an unserialized kit from an unlicensed seller violates federal law. If you already own an unserialized firearm: Possession itself isn't automatically a federal crime, but the firearm must be serialized.

The Center for American Progress explains that under current federal law, gun manufacturers and importers are required to engrave a serial number on the frame or receiver of each firearm, and gun dealers must conduct a background check before selling any firearm.

An unserialized firearm that hasn't been brought into compliance is a violation of federal regulations. If you're manufacturing a firearm for personal use: The ATF rule doesn't prohibit individuals from making their own firearms for personal use. However, if you use a kit that contains an unserialized frame or receiver purchased after August 2022, you've likely violated the law.

Homemade firearms that are never sold or transferred and remain in your possession occupy a more complex legal position. The key distinction is that federal law now treats the frame or receiver as the firearm itself. Once you possess an unserialized frame or receiver that was sold after the rule took effect, you're in possession of an illegal firearm.

The Legal Definition of a Frame or Receiver

Understanding what counts as a frame or receiver is essential because it determines whether the ATF rule applies to your situation. The ATF's regulatory definition covers the part of a firearm that provides the housing for the hammer, bolt, or breechblock, and the firing mechanism. For most firearms, this is the lower receiver.

The 2022 rule expanded this definition to include "a partially complete, disassembled, or nonfunctional frame or receiver" if the part "may readily be completed, assembled, restored, or otherwise converted" to function as a frame or receiver.

The rule also considers the "totality of the circumstances," including:

• Whether the part is sold with jigs, templates, or instructions

• Whether the part is designed to be easily completed with common tools

• Whether the seller markets the part as something that can be turned into a firearm

This definitional change is what brought most ghost gun kits under federal jurisdiction. A block of metal with pre-drilled holes that's sold with a jig and instructions is now legally indistinguishable from a finished receiver.

How This Plays Out in Practice

Consider a common scenario: someone buys a "80% lower" receiver kit online. The kit includes an unfinished receiver, a jig for drilling the fire control pocket, and a drill bit. Before August 2022, this purchase required no background check, no serial number, and no involvement from a licensed dealer.

After the rule took effect, the same purchase requires the seller to be a licensed dealer, the receiver to be serialized, and the buyer to pass a background check.

If the buyer completes the receiver at home and later sells the finished firearm without a serial number, they've committed a federal violation. In practice, many individuals who purchased kits before the rule took effect are still in possession of unserialized firearms. The ATF rule requires these firearms to be serialized, but enforcement has been inconsistent.

Some states have passed their own laws requiring serialization, while others have taken no action. This creates a patchwork of compliance obligations that varies significantly depending on where you live. If you find yourself in possession of an unserialized firearm, you have a few options.

You can take it to a licensed dealer to have a serial number added, which is the compliant path. You can also consult with an attorney who practices firearms law to understand your specific obligations.

The League of Women Voters notes that ghost guns were previously not considered firearms under federal law, which is precisely why the regulatory change was necessary—and why the rules are still evolving.

How Rules Differ by State

Federal law sets the floor, but states can impose additional requirements. Some states have gone further than the ATF rule:

• California, New York, and New Jersey have banned ghost guns outright, making possession of an unserialized firearm a state crime regardless of federal compliance.

• Several states require serialization of all firearms, including homemade ones, and require background checks for all firearm transfers, including private sales.

• Other states have passed laws prohibiting local law enforcement from enforcing federal firearm regulations, creating a conflict between state and federal authorities.

This state-by-state variation matters for anyone who travels with firearms, sells parts, or purchases kits online. A purchase that's legal in one state may be a felony in another. The proposed federal legislation would create a uniform national standard, but until it passes, you need to check both federal and state law.

Mistakes That Can Create Legal Trouble

The most common mistakes people make with ghost guns and unserialized firearms are avoidable: Buying from unlicensed sellers. Online marketplaces and gun shows still feature unserialized kits. Purchasing from anyone who isn't a licensed dealer after August 2022 puts you on the wrong side of federal law.

Assuming "80%" means "not a firearm." The term "80% receiver" refers to the percentage of machining completed, not the legal status. Under the 2022 rule, many 80% receivers are now legally considered firearms.

Selling or transferring without a background check. Even if you lawfully possess a serialized firearm, selling it privately without going through a licensed dealer may violate federal law depending on the circumstances.

Failing to serialize an existing ghost gun. If you built a firearm before the rule took effect, it must be serialized. Failure to do so is a violation of ATF regulations. Assuming state law compliance means federal compliance. States can't override federal law, but they can add requirements.

Being compliant with your state doesn't automatically mean you're compliant federally, and vice versa.

Doing It Yourself vs.

Getting Professional Help If you're dealing with questions about firearm compliance, you have a few paths forward:

• DIY approach: You can research ATF regulations, state statutes, and local ordinances on your own.

This is feasible for simple questions, but the regulatory landscape is complex and penalties for mistakes are severe.

• Traditional attorney: A firearms law attorney can provide personalized advice and representation.

This is the most thorough option but also the most expensive, with hourly rates that can quickly exceed several thousand dollars for a simple compliance question.

• Flat-fee document preparation: For situations that require written documentation—such as a compliance statement, a petition regarding a seized firearm, or a response to a regulatory inquiry—flat-fee services like Forge & Ellis offer attorney-reviewed document preparation at a predictable cost.

This is a practical middle ground when you need professionally prepared documents without the expense of full legal representation. The right choice depends on your situation. If you're facing criminal charges, you need an attorney.

If you need to prepare documentation to address a compliance issue, a flat-fee service may be sufficient.

Key Points to Watch

The legal status of ghost guns and unserialized firearms is still evolving. Congress has considered legislation that would codify the ATF rule into statute, and additional state laws are being passed regularly.

If you own a firearm kit, an unfinished receiver, or a firearm you built yourself, the most important step is understanding your obligations under both federal and state law.

For those who need to prepare documentation related to firearm compliance—whether it's a response to an inquiry, a petition, or another legal filing—Forge & Ellis provides attorney-reviewed document preparation services at a flat fee.

Having professionally prepared documents can make a meaningful difference when dealing with regulatory matters. This content provides general legal information and does not create an attorney-client relationship. Laws and procedures vary by jurisdiction.

Forge & Ellis prepares attorney-reviewed legal documents with state-specific considerations and delivers professionally formatted documents through a simple flat-fee process.