Possessing a Glock switch is a federal felony punishable by up to 10 years in prison and fines as high as $250,000, even if the device is never attached to a gun. Glock switch charges get worse fast: if the switch is linked to drug trafficking or a violent crime, federal law imposes a mandatory minimum of 30 years, and a second such conviction means mandatory life. Because civilian machine gun registration closed in 1986, there is no legal way to own one.
Why the Law Treats a Switch as a Machine Gun
A Glock switch is a small device, roughly the size of a quarter, that replaces the backplate on a Glock pistol and lets it fire continuously with a single trigger pull. The National Firearms Act defines a machine gun as any weapon that fires more than one shot automatically with a single trigger pull, and that definition also covers any part designed and intended to convert a weapon into a machine gun.1Office of the Law Revision Counsel. 26 USC 5845 – Definitions The switch itself is a machine gun under federal law, whether it is sitting in a drawer, in a shipping package, or attached to a firearm.
You cannot register your way out of this. The Hughes Amendment bans civilian possession of any machine gun not lawfully registered before May 19, 1986.2Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts Every Glock switch in existence was made after that date. The ATF will not accept an application, and no tax stamp exists that makes possession legal.
The Charges You Can Face
Federal prosecutors work from two main statutes. The National Firearms Act’s prohibited-acts provision makes it illegal to possess, make, or transfer an unregistered NFA firearm.3Office of the Law Revision Counsel. 26 USC 5861 – Prohibited Acts The Hughes Amendment separately bans civilian possession of a machine gun outright.2Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts Charges commonly break down into the following.
Possession
Because a switch cannot be registered, anyone holding one holds an unregistered machine gun. It does not matter whether the switch has ever been installed, or whether the person owns a Glock at all. The ATF has stated that a conversion device on its own is an illegal machine gun.4Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF). U.S. Attorney and ATF Release New Public Service Announcement Warning Against Possession of Machine Gun Conversion Devices
The NFA’s machine gun definition also reaches any combination of parts that could be assembled into a machine gun if those parts are in someone’s possession or control.1Office of the Law Revision Counsel. 26 USC 5845 – Definitions Keeping a switch in a box next to a compatible Glock gives prosecutors a constructive possession theory. Holding one “for a friend” is still possession. Proximity to a firearm makes a case worse, but no firearm needs to be present for the charge itself.
Manufacturing
Making a switch, whether by 3D printing, machining, or any other method, is manufacturing a machine gun without a license. Penalties match those for possession, but prosecutors often treat it as more serious because it undercuts any claim of not knowing what the device was.5Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF). Privately Made Firearms
Transferring
Selling, giving away, or otherwise passing a switch to another person is a separate federal offense, and each transfer can be charged on its own count.3Office of the Law Revision Counsel. 26 USC 5861 – Prohibited Acts Someone who sells five switches can face five counts. Online sales through social media and messaging apps are a major enforcement focus.
Importing
Most switches seized in the United States come from overseas, often mislabeled as toys or jewelry. Federal law prohibits anyone other than properly licensed parties from moving a machine gun in foreign commerce.2Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts The federal smuggling statute adds up to 20 years in prison for knowingly bringing in prohibited merchandise or receiving goods known to have been imported illegally.6Office of the Law Revision Counsel. 18 USC 545 – Smuggling Goods Into the United States Ordering one from an overseas seller does not protect the buyer; the recipient is the one bringing contraband into the country. Customs intercepts these shipments regularly, and a seized package often triggers a controlled delivery, with agents making the arrest when the box arrives.
Penalties When the Switch Is the Only Charge
Both main NFA charges carry a maximum of 10 years in prison. The NFA sets a fine ceiling of $10,000,7Office of the Law Revision Counsel. 26 USC 5871 – Penalties but the general federal fine statute raises the ceiling to $250,000 for any felony unless the specific offense statute exempts itself, and the NFA does not.8Office of the Law Revision Counsel. 18 USC 3571 – Sentence of Fine A judge can impose a fine up to $250,000.
Ten years is the ceiling. What people actually serve is driven by the Federal Sentencing Guidelines, which set a base offense level of 16 for machine gun possession. For a first-time offender with no aggravating factors, the recommended range is roughly 21 to 27 months. Criminal history, the number of devices, whether a firearm was present, and other factors push the range up. Prison is followed by supervised release of up to three years, because a 10-year maximum makes this a Class C felony.9Office of the Law Revision Counsel. 18 USC 3583 – Inclusion of a Term of Supervised Release After Imprisonment
A conviction also strips firearm rights for life. Federal law bars anyone convicted of a crime punishable by more than one year of imprisonment from owning or possessing guns or ammunition.10Bureau of Alcohol, Tobacco, Firearms and Explosives. Identify Prohibited Persons
Mandatory Minimums When the Switch Is Tied to Another Crime
The numbers above assume the switch is the only charge. When it is connected to something else, the exposure changes completely. Using, carrying, or possessing a machine gun during a violent crime or drug trafficking offense triggers a mandatory minimum of 30 years. The judge has no discretion to go lower. A second conviction under the same provision involving a machine gun triggers mandatory life.11Office of the Law Revision Counsel. 18 USC 924 – Penalties
The sentence also runs consecutively, stacked on top of the underlying crime rather than served at the same time. A drug trafficking conviction with a switch can realistically produce 40 or more years in federal prison. Carrying an ordinary firearm during a drug deal triggers a 5-year mandatory minimum. Adding a switch to the same firearm — or even having the switch nearby — pushes that to 30.
State Charges and How They Fit In
Federal law is the main enforcement tool, but more than half of states have enacted their own bans on machine gun conversion devices. As of early 2025, at least 26 states prohibit auto sears and similar devices. State penalties vary but commonly include felony charges with prison terms of several years and fines that can reach $5,000 or more.
State law matters practically because a local officer who finds a switch during a traffic stop or search can arrest on the spot rather than waiting for federal agents. Many cases start as state arrests and are then adopted by federal prosecutors, who have access to the NFA penalties and the 30-year mandatory minimum. Joint ATF task forces are common. Even in states without a specific auto sear statute, general bans on illegal weapons or machine guns often cover switches, and the federal prohibition applies everywhere regardless of what state law says.