Ghost Guns and What the Law Requires

What Is a Ghost Gun

A ghost gun is a firearm made by a private person, usually from a kit, a partly finished frame, or a 3D printer, that has no serial number. Federal agencies call them privately made firearms. Without a serial number or a sales record, police who recover one cannot trace it back to where it was made or who bought it.

The name comes from the missing serial number, not from the gun being invisible. Most ghost guns are ordinary-looking pistols. A separate federal law, the Undetectable Firearms Act, bans guns that metal detectors cannot find (18 U.S.C. 922(p)).

The Supreme Court Ruling

The case turned on a product called the “Buy Build Shoot” kit, sold by the company Polymer80. According to the record the Supreme Court described, the kit came with “all of the necessary components to build” a Glock-style pistol. In an ATF test, “an individual who had never before encountered the kit was able to produce a gun from it in 21 minutes using only ‘common’ tools and instructions found in publicly available YouTube videos” (Bondi v. VanDerStok).

The Gun Control Act of 1968 requires licensed makers and sellers to run background checks, keep records, and put serial numbers on firearms. In 2022, ATF wrote a rule saying that some kits and some unfinished frames count as “firearms” under that law, so the companies selling them have to follow the same rules as gun dealers. Gun makers and buyers sued, and the Fifth Circuit struck the rule down.

On March 26, 2025, the Supreme Court reversed, 7-2. Justice Neil Gorsuch wrote for the Court that the law’s definition of a firearm covers some kits, including Polymer80’s. The Court also held that a frame needing only the removal of a few plastic tabs and a “few holes” drilled, tasks that take minutes, is a “frame” under the law.

The ruling has limits. The Court decided a facial challenge, meaning it asked only whether the rule could be valid in some cases. It said it did “not suggest that the GCA reaches, and ATF may regulate, any combination of parts susceptible of conversion into a frame or receiver with sufficient time, tools, and expertise.” Kits and parts further from a finished gun may still fall outside the law; the Court said the case did “not require us to untangle exactly how far” the definition reaches, and sent it back for further proceedings. The case turned on the Gun Control Act’s words, not the Constitution; the 2nd Amendment page covers the constitutional test.

What the Law Requires, by Who Is Involved

The federal rules depend on who is making, selling, or holding the gun. The 2022 rule mostly regulates businesses. It leaves people who build their own guns largely alone.

State law can add more. In several states, even a gun built for personal use must carry a serial number, as the state table below shows.

How Many Ghost Guns Police Recover

Recoveries grew almost 17-fold from 2017 to 2023, then leveled off. Police traced 27,232 suspected ghost guns in 2022 and 27,490 in 2023, a change of less than 1%.

Suspected privately made firearms recovered by police and traced by ATF, by year

Category	Value
2017	1629
2018	2648
2019	5926
2020	8504
2021	19273
2022	27232
2023	27490

Source: ATF, National Firearms Commerce and Trafficking Assessment, Volume IV, Part V (January 2025), Figure PMF-01, archived copy; the report is no longer on ATF's website. Counts include machine-gun conversion devices, which ATF classifies as privately made firearms.

ATF itself warns that the rise is partly a counting effect. It attributes the growth both to more ghost guns being made and recovered and to police getting better at identifying and tracing them. ATF also says there are likely “much higher numbers” of recovered ghost guns that were never submitted for tracing. Across 2017 to 2023, the traced ghost guns were linked to about 1,692 homicide-related offenses.

Recoveries stopped climbing in 2023, the first full year after the rule took effect in August 2022. ATF has not published a study of whether the rule caused that, and other factors, including state laws and changes in how police report, could explain it.

A 3D-Printed Gun Metal Detectors Missed

Kits dominated the early cases. ATF’s January 2025 report, which is no longer on the agency’s website, describes the newer threat through a Wisconsin investigation. In October 2021, ATF agents and the Brown County Drug Task Force began investigating a man with a felony conviction who was making and selling ghost guns, and trading some of them for methamphetamine (ATF).

On November 15, 2021, officers searched his basement and found 3D printers, digital files for printing guns, printed frames and slides, and a finished 3D-printed .22 caliber pistol. ATF confirmed the pistol worked. Then ATF ran it through a TSA-certified metal detector, and the detector did not alert. The report calls it “the first documented law enforcement seizure of a functional 3D-printed, polymer firearm determined to be undetectable for metal content.” The man pleaded guilty and was sentenced in March 2023 to 46 months in prison.

Where the Fights Stand

The 2022 rule is still in force, but the administration that now enforces it is reviewing it. One part of it, on how long dealers keep records, is already proposed for change.

Where Federal Ghost Gun Rules Stand

As of October 8, 2026

• ATF kit and frame rule (87 FR 24652) Law, upheld

  In effect since August 24, 2022. The Supreme Court upheld it against a facial challenge on March 26, 2025. (source)

• Bondi v. VanDerStok Final ruling, sent back

  The Supreme Court reversed the Fifth Circuit and sent the case back for further proceedings. It decided only the facial challenge. (source)

• Executive Order 14206, "Protecting Second Amendment Rights" Agency action

  Signed February 7, 2025. It told the Attorney General to review federal gun rules and actions from January 2021 through January 2025, including ATF's 2022 kit and frame rule. (source)

• Permanent dealer records Proposal

  The 2022 rule made dealers keep sales records indefinitely. A May 2026 ATF proposal would cut that to 20 or 30 years. Comments closed August 4, 2026. (source)

• Undetectable Firearms Act Law

  Bans making or possessing a gun that a metal detector cannot find, including a 3D-printed one. (source)

Source: Supreme Court; Federal Register; ATF

The ledger reflects Federal Register records through October 8, 2026. We found no final rule rescinding the kit and frame definitions as of that date.

Which States Regulate Ghost Guns

Seventeen states regulate ghost guns, by the count of the gun safety group Everytown, last updated January 14, 2026. The rules range from requiring serial numbers on gun parts to banning 3D printing of guns.

This table summarizes each state’s rules. It is not legal advice, and state laws change often. Check your state attorney general’s website or a lawyer before building, buying, or selling a gun or gun parts. Several of the same states also ban the sale of AR-15-style rifles, covered in assault weapons bans by state.

If Ghost Gun Laws Affect You

What to know, by situation

Open the one closest to yours. This is general information, not legal advice.

I build my own guns as a hobby

1. Federal law lets you build a gun for your own use without a serial number, if you can legally own a gun.
2. You cannot build guns to sell as a business without a federal license.
3. Check your state first. Several states require a serial number even on a gun you build for yourself.

The 2022 rule says it does not "prohibit individuals from assembling or otherwise making their own firearms from parts for personal use."

I want to buy a gun kit or unfinished frame

1. Expect many kits to be sold only through a licensed dealer with a background check, the way a finished gun is.
2. Check whether your state bans or restricts the kit before you buy it.

The Supreme Court upheld the rule treating kits that are readily completed as firearms.

I know someone making or selling guns illegally

1. In an emergency, call 911.
2. Otherwise, report it to ATF through its tip page, or to local police.

Someone I live with may be a danger to themselves or others

1. In an emergency, call 911. For a mental health crisis, call or text 988.
2. Many states let family or police ask a court to remove guns temporarily. Our guide to red flag laws explains how.

The Honest Disagreement

The case for regulating kits comes from law enforcement and the Justice Department. The government told the Supreme Court that efforts to trace ghost guns have proven “almost entirely futile,” and ATF’s reports document ghost guns in homicides, drug trafficking, and a domestic terrorism investigation. Supporters argue that a kit sold to be finished in minutes is a gun sold without a background check.

The case against comes from gun owners and the firearms industry. The National Shooting Sports Foundation, the industry’s trade group, calls ghost guns “a gun control bogeyman,” says home building is a hobby that “has not created a wave of ‘ghost guns,’” and argues that 3D printing is too costly and difficult for criminals to use (NSSF). In dissent, Justice Clarence Thomas wrote that the government asked the Court “to rewrite statutory text so that it can regulate weapon-parts kits,” adding, “This time, the Court obliges. I would not.”

The two sides disagree about the facts on 3D printing. The industry says criminals “are not using” 3D printers to make guns. ATF’s own report documents a Wisconsin man who did, and a pistol that got past a metal detector. What neither side has measured is how many ghost guns the 2022 rule has kept out of the wrong hands.

What the Numbers Leave Out

• Traces are not all recoveries. ATF counts only ghost guns that police send in for tracing. Departments that do not submit them do not appear in the totals.
• The counts include “switches.” ATF classifies machine-gun conversion devices, which turn a pistol into an automatic weapon, as privately made firearms, so they are part of the recovery numbers.
• California is a large share. California averaged about 10,562 recoveries a year in 2022 and 2023, according to ATF, so national trends partly reflect one state’s enforcement.
• A recovered gun is not always a crime gun in use. Recoveries include guns found during searches and arrests, not only guns fired in crimes.

Frequently Asked Questions

Are ghost guns illegal?

Not in themselves under federal law. A person who can legally own a gun may build one for personal use without a serial number. Selling kits that are readily made into guns now requires a license and a background check, and making a gun that metal detectors cannot find is a federal crime. Several states ban or restrict ghost guns more tightly.

Can a ghost gun be traced?

Usually not back to a buyer. Tracing relies on a serial number and a dealer’s sales record, and a ghost gun made at home has neither. ATF’s 2022 rule requires serial numbers when a dealer takes one in, and on kits sold as firearms, so more of them can be traced.

Are 3D-printed guns illegal in the U.S.?

Federal law does not ban making a 3D-printed gun for personal use, but it does ban any gun that a metal detector cannot find. Several states, including Colorado, Delaware, Hawaii, New Jersey, Rhode Island, Virginia, and Washington, ban 3D printing of guns, and California requires a license.

What did the Supreme Court decide about ghost guns?

In Bondi v. VanDerStok (2025), the Court ruled 7-2 that ATF’s rule was not invalid on its face. Some gun kits and nearly finished frames count as firearms under the Gun Control Act, so the companies selling them must follow the same rules as gun dealers.

What You Can Do

1. Know your state’s law. If you build or buy gun parts, check your state attorney general’s guidance first. The rules differ sharply from state to state.

2. Ask your state legislators where they stand. Seventeen states regulate ghost guns. Ask whether yours requires serial numbers on gun parts and reporting of ghost guns.

3. Watch the federal review. The 2022 rule is under review under Executive Order 14206. Final changes to ATF rules are published in the Federal Register, where the public can read and comment on proposals.

4. Store guns securely, including ones you built. A gun with no serial number is still a gun a child or someone in crisis can reach. If someone at home is at risk, our red flag laws guide explains how families can ask a court to remove guns temporarily.