A gun charge becomes a federal offense when one of four things is true: the person holding the gun is legally barred from having one under federal law, the firearm was used or carried during another federal crime, the weapon itself is restricted under federal registration rules, or the offense happened on federal property or inside a federal gun-free school zone. Most gun crimes in the United States are prosecuted in state court. What pulls a case into the federal system is a specific statutory trigger, and federal charges almost always carry stiffer penalties, including mandatory minimums a judge cannot reduce.
Possession by a Prohibited Person
The single most common federal gun charge is possessing a firearm or ammunition as a “prohibited person.” Federal law lists nine categories of people who cannot receive, ship, transport, or possess a gun, regardless of state law:1Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts
- Anyone convicted of a crime punishable by more than one year in prison, whether or not they actually served that long
- Fugitives from justice
- Unlawful users of controlled substances, including marijuana users in states where it is legal
- People adjudicated as mentally defective or committed to a mental institution
- Certain noncitizens, including those unlawfully present and those on nonimmigrant visas
- People dishonorably discharged from the military
- People who have renounced U.S. citizenship
- People under a qualifying domestic violence restraining order issued after notice and a hearing
- People convicted of a misdemeanor crime of domestic violence
A violation of any of these categories carries up to 15 years in federal prison.2Office of the Law Revision Counsel. 18 USC 924 – Penalties The penalty jumps sharply under the Armed Career Criminal Act. A prohibited-person defendant with three or more prior convictions for violent felonies or serious drug offenses faces a 15-year mandatory minimum with no probation. The average sentence under that enhancement was 199 months — over 16 years — in fiscal year 2024, compared to 67 months for defendants without it.3United States Sentencing Commission. Section 922(g) Firearms
Federal jurisdiction applies to prohibited-person charges because virtually every firearm in the United States has moved through interstate commerce at some point. It doesn’t matter where the gun was bought or where the possessor lives.
A Note on Marijuana Users
Federal law still classifies marijuana as a controlled substance. That means someone who uses marijuana — recreationally or medicinally, even in a state where it is fully legal — falls into a prohibited category for firearm possession. The ATF’s background check form asks buyers directly whether they are unlawful users of any controlled substance. As of March 2026, the Supreme Court is reviewing whether this ban is constitutional, but until the Court rules, the federal prohibition is fully enforceable.4SCOTUSblog. Supreme Court Skeptical of Law Banning Drug Users From Possessing Firearms
Using or Carrying a Gun During Another Federal Crime
One of the harshest federal gun provisions kicks in when a firearm is used, carried, or possessed during a federal drug trafficking crime or a crime of violence. The penalty is a mandatory minimum that stacks on top of the sentence for the underlying crime, and it cannot run concurrently with any other prison term.
- Possessing or carrying: at least 5 years, consecutive
- Brandishing the firearm: at least 7 years
- Discharging the firearm: at least 10 years
- Second or subsequent offense: at least 25 years
- Machine gun, silencer, or destructive device on a second offense: life in prison
No probation is available for any of these offenses.2Office of the Law Revision Counsel. 18 USC 924 – Penalties
The consecutive-sentence requirement is what makes this charge so punishing. Someone facing a 10-year federal drug conspiracy who also carried a gun during the offense is looking at 15 years minimum. If the gun was brandished, the floor rises to 17. Federal prosecutors use this provision aggressively in plea negotiations because the math is so unforgiving.
Restricted Weapons Under the National Firearms Act
Some weapons are so heavily regulated at the federal level that merely possessing one without proper registration is itself a federal crime. The National Firearms Act covers:
- Machine guns, meaning any firearm that shoots more than one round per trigger pull
- Short-barreled rifles with barrels under 16 inches
- Short-barreled shotguns with barrels under 18 inches
- Silencers
- Destructive devices such as grenades, bombs, and certain large-caliber weapons
Possessing any of these items without registering it and paying the required tax is punishable by up to 10 years in federal prison and a $10,000 fine.5Office of the Law Revision Counsel. 26 USC 5871 – Penalties Civilians cannot register new machine guns manufactured after 1986, so for most people, possessing a machine gun at all is a federal offense.
Machine gun conversion devices — small parts often called switches or auto sears that turn semi-automatic pistols into machine guns — are classified as machine guns themselves. Possession of the device alone, even when it is not installed, carries up to 10 years.6Bureau of Alcohol, Tobacco, Firearms and Explosives. Privately Made Firearms Possessing any firearm with a removed or altered serial number is also a federal offense, and the charge applies to anyone found with the weapon, not just the person who altered it.7United States Courts for the Ninth Circuit. Model Criminal Jury Instruction 14.19 – Firearms Transportation, Shipment, Possession or Receipt in Commerce with Removed or Altered Serial Number
Straw Purchases and Firearms Trafficking
Buying a gun for someone else who is prohibited from having one, or who intends to use it in a crime, is a federal offense known as a straw purchase. The Bipartisan Safer Communities Act of 2022 created dedicated federal statutes for both straw purchasing and firearms trafficking.
A straw purchase carries up to 15 years in federal prison. If the buyer knows or has reason to believe the gun will be used in a felony, an act of terrorism, or a drug trafficking crime, the maximum rises to 25 years.8Office of the Law Revision Counsel. 18 USC 932 – Straw Purchasing of Firearms Firearms trafficking — knowingly transferring a gun to someone when you know or have reasonable cause to believe their possession would be a felony — carries up to 15 years, and so does conspiring to traffic.9Office of the Law Revision Counsel. 18 USC 933 – Trafficking in Firearms
Gun-Free School Zones
Federal law makes it a crime to knowingly possess a firearm within 1,000 feet of a public or private school. The penalty is up to five years, and the sentence cannot run concurrently with other terms of imprisonment.1Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts
Several exceptions matter in practice. The law does not apply to someone with a state-issued concealed-carry license from the state where the school zone sits, as long as that state requires law enforcement to verify eligibility before issuing the license. It also doesn’t reach firearms on private property not part of the school grounds, unloaded firearms stored in a locked container in a vehicle, or firearm use in a school-approved program. School-zone charges are most often stacked onto other federal gun offenses rather than brought alone, but they add real leverage, especially in cities where school zones blanket large parts of the map.
Federal Property and Facilities
Any gun offense on federal property puts the case in federal jurisdiction. Specific penalties apply to bringing a firearm into a federal facility:
- Simple possession in a federal building other than a courthouse: up to one year
- Possession with intent to use in a crime: up to five years
- Possession in a federal courthouse: up to two years
Law enforcement officers, authorized military personnel, and people lawfully carrying for hunting or other lawful purposes are exempt.10Office of the Law Revision Counsel. 18 USC 930 – Possession of Firearms and Dangerous Weapons in Federal Facilities
Federal property includes national parks, military installations, federal courthouses, and government office buildings. Tribal reservations also fall under federal jurisdiction for many criminal offenses, with the FBI drawing authority from the General Crimes Act and the Major Crimes Act to investigate crimes on roughly 200 reservations.11Federal Bureau of Investigation. Indian Country Crime The federal post office gun ban is currently in flux. A federal district court in Texas ruled in 2025 that the ban violates the Second Amendment, but the case is on appeal to the Fifth Circuit and is not a final resolution.
The Interstate Commerce Hook
Almost every federal gun charge depends on a connection to interstate commerce, even when the whole offense happened in one state. The Constitution gives Congress authority over interstate commerce, and because nearly every firearm manufactured in the United States has crossed a state line between the factory and the end user, federal courts have consistently found the commerce element satisfied.
The Gun Control Act of 1968 built the modern framework. It requires anyone engaged in the business of manufacturing, importing, or selling firearms to hold a federal license, and it generally bars unlicensed people from transferring firearms outside a licensed dealer.12Congress.gov. Gun Control: Juvenile Record Checks for 18- to 21-Year-Olds For prosecutors, the commerce hook is almost never a real obstacle. If the facts fit a federal statute, the jurisdictional element is usually a given.
Why a Case Ends Up in Federal Court
Qualifying for federal prosecution and actually being prosecuted federally are two different things. U.S. Attorneys have wide discretion. A routine possession charge with no aggravating facts tends to stay in state court. The same charge paired with a drug conspiracy, a long prior record, or trafficking across state lines is far more likely to be picked up federally.
Project Safe Neighborhoods coordinates federal, state, and local law enforcement to route the most serious gun offenders into federal court, where sentences are typically longer and there is no parole. The practical factors that pull a case federal include: the gun was used in another federal crime, the defendant is a prohibited person with significant priors, the case involves trafficking or straw purchases, the weapon is NFA-regulated, or the offense happened on federal property. A single-gun case with a first-time defendant and no federal nexus beyond interstate commerce is the least likely to draw federal attention, though prosecutors retain the authority to bring it.