If you are caught with a gun switch, federal law treats the device itself as a machine gun, and the federal charges for a gun switch start at up to 10 years in prison and a $250,000 fine for simple possession — before any other crime, and whether or not the switch is attached to a firearm.
What a Gun Switch Is
A gun switch is a small metal or plastic part, roughly the size of a quarter, that clips onto the back of a semi-automatic handgun. The most common version fits on the rear slide plate of a Glock, which is why police often call them “Glock switches.” Once installed, the device bypasses the disconnector, the internal part that normally stops the gun after each shot. The pistol then keeps firing as long as the trigger is held and ammunition remains in the magazine.
Why Federal Law Calls It a Machine Gun
The National Firearms Act defines “machinegun” to include not just complete automatic weapons but any part, or combination of parts, designed to convert a weapon into one.1Office of the Law Revision Counsel. 26 USC 5845 Definitions A switch exists for exactly that purpose, so the device itself is a machine gun under federal law.
That classification matters because civilian possession of machine guns manufactured after May 19, 1986, is banned outright under the Firearm Owners Protection Act.2Office of the Law Revision Counsel. 18 USC 922 Unlawful Acts Every switch is a newly manufactured conversion device, so every switch falls inside the ban. There is no registration process, no tax stamp, and no license that makes civilian possession of a gun switch legal.
Penalties for Possession Alone
Federal prosecutors can charge gun switch possession under the National Firearms Act, which makes it a crime to possess an unregistered machine gun. The maximum sentence is 10 years in federal prison.3Office of the Law Revision Counsel. 26 US Code 5871 – Penalties The NFA caps fines at $10,000, but a separate federal sentencing statute raises the maximum fine for any individual felony conviction to $250,000.4Office of the Law Revision Counsel. 18 US Code 3571 – Sentence of Fine
Prosecutors often add charges under the Gun Control Act’s machine gun ban, which independently prohibits possessing or transferring a machine gun.2Office of the Law Revision Counsel. 18 USC 922 Unlawful Acts A single arrest for a gun switch typically produces charges under both statutes, plus additional counts if other firearms or drugs are found during the same search. State charges can stack on top, with maximum state prison terms for machine gun possession typically running 3 to 15 years depending on the jurisdiction.
For a sense of actual sentencing: a Seattle man arrested with more than 100 Glock switches and 20 ghost guns received 27 months in federal prison plus three years of supervised release after pleading guilty.5Department of Justice. Seattle Man Arrested With Twenty Ghost Guns and More Than 100 Glock Switches Sentenced to 27 Months Defendants who go to trial and lose generally receive substantially more. Federal convictions carry no parole, so you serve at least 85 percent of whatever the judge imposes.
The 30-Year Mandatory Minimum When Another Crime Is Involved
The numbers change dramatically when a switch is tied to another offense. Under 18 U.S.C. § 924(c), anyone who possesses a machine gun during a crime of violence or a drug trafficking crime faces a mandatory minimum of 30 years in federal prison. No parole, no early release, no judicial discretion to go lower.6Office of the Law Revision Counsel. 18 USC 924 Penalties
A second conviction under the same provision triggers mandatory life without the possibility of release.6Office of the Law Revision Counsel. 18 USC 924 Penalties This is where people most underestimate the risk. Carrying a pistol with a switch during what would otherwise be a comparatively minor drug charge can turn a few years in prison into three decades.
You Do Not Have to Attach the Switch
A common misconception is that a switch is only illegal once it is installed on a firearm. It isn’t. The NFA’s definition of machine gun explicitly covers any combination of parts from which a machine gun can be assembled, so long as those parts are in your possession or control.1Office of the Law Revision Counsel. 26 USC 5845 Definitions The ATF has confirmed in a formal ruling that a device designed to initiate automatic fire is a machine gun under both the NFA and the Gun Control Act, whether assembled or not.7Bureau of Alcohol, Tobacco, Firearms and Explosives. ATF Ruling 2006-2 Definition of Machinegun
A switch in a drawer and the compatible pistol in a safe across the room still satisfy the legal definition. The parts do not have to be connected. If law enforcement can show you had both under your control, the charges are the same as if the device had been installed and firing.
Printing or Importing a Switch Adds More Charges
Switches do not come through legitimate retail channels. Most enter the country through overseas shipments, often from China, mislabeled on customs paperwork. A federal case in Florida involved a package from Shenzhen containing 63 conversion devices sent through the U.S. Postal Service; the smuggling charges alone carried up to 20 years in federal prison.8U.S. Immigration and Customs Enforcement. Convicted Felon Arrested for Smuggling Machine Gun Conversion Devices Into US
Switches are increasingly 3D-printed. CAD files circulate online, and a consumer-grade printer can produce a working switch from inexpensive plastic in a few hours. The NFA targets “parts,” not blueprints, so possessing a digital file alone sits in a murkier legal area, but actually printing the switch crosses into manufacturing a machine gun. Federal prosecutors have secured lengthy sentences in 3D-printing cases, including one trafficker who received over seven years.9Bureau of Alcohol, Tobacco, Firearms and Explosives. Trafficker of 3D-Printed Glock Switches and Auto-Sears Sentenced to Over Seven Years Federal
Property You Can Lose
Prison is not the only financial exposure. Federal law allows the government to seize property connected to a firearms offense through civil asset forfeiture. A vehicle used to transport a switch, or a home where one is found, can be the subject of forfeiture proceedings. The government must show a “substantial connection” between the property and the criminal activity, meaning the property made the offense easier to carry out or harder to detect.10Department of Justice. Asset Forfeiture Policy Manual 2025
Vehicles with aftermarket hidden compartments face an even lower bar. The DOJ’s policy manual waives the normal minimum-equity requirements for these vehicles, citing a “compelling law enforcement interest” in seizing them.10Department of Justice. Asset Forfeiture Policy Manual 2025 Civil forfeiture is a separate proceeding from the criminal case and uses a lower standard of proof, so the government can take the property even if the criminal charges are later reduced or dismissed.
What About Binary and Forced-Reset Triggers
Not every device that speeds up a firearm is a machine gun under federal law. Binary triggers fire one round on the pull and a second on the release. Because that involves two separate physical movements rather than a single trigger function, the ATF has determined that binary triggers do not meet the NFA’s definition and remain legal federally, though some states restrict them.
Forced-reset triggers have had a more complicated path. The ATF initially classified FRT-15s and similar devices as machine guns, but in July 2024 a federal court in the Northern District of Texas ruled that FRT-15s and Wide Open Triggers are not machine guns under the NFA. Under a subsequent settlement, the government agreed not to enforce the machine gun statutes against people possessing or transferring eligible FRTs.11Bureau of Alcohol, Tobacco, Firearms and Explosives. Rare Breed Triggers FRT-15s and Wide-Open Triggers WOTs Return That area of the law is still developing. The treatment of auto sears like Glock switches is not — they allow continuous fire from a single trigger pull and are unambiguously machine guns.