Glock switches — small parts that can convert a semi-automatic Glock into a fully automatic weapon — are classified under federal law as machine guns. Possession, transfer, or manufacture of a Glock switch without proper authorization is a serious federal crime.
But how long will you actually go to jail for having a switch on a Glock?
What are the precise laws behind it?
How did these devices come into existence, and why are they so heavily regulated?
This article provides a full, in-depth breakdown, with legal references, historical context, and current 2025 standards, to help you fully understand the risks involved.
What Are the Penalties for Possessing a Glock Switch?
Under federal law, any firearm modification that turns a semi-automatic gun into a full-automatic weapon — including a Glock switch — is treated as possession of a machine gun. Possessing a Glock switch is a serious federal crime, even if the device has not been installed on a firearm.
The United States Code Title 18, Section 922(o) and the National Firearms Act (NFA) Section 5845(b) make it crystal clear:
- Possessing a machine gun without proper authorization is a serious federal crime.
- Even simple possession, without firing or installing the switch, can result in felony charges.
- Federal Penalties for possessing an illegal Glock switch:
- Up to 10 years in federal prison (even for first-time offenders)
- Up to $250,000 in criminal fines
- Permanent loss of firearm rights under federal law
- Seizure of the Glock, the switch, and possibly any other firearms owned
- If the Glock switch is used during a violent crime or drug-related activity, additional charges may apply, leading to sentences of 20 years or more.
Understanding the Laws: Title 18 § 922(o) and NFA § 5845(b)
When it comes to Glock switches, two major federal laws apply:
United States Code Title 18, Section 922(o)
This law prohibits the possession or transfer of machine guns unless:
- The machine gun was lawfully possessed before May 19, 1986.
- The person is an authorized government official or licensed dealer/manufacturer.
What This Means:
- No civilian can legally possess a machine gun (including a Glock switch-converted Glock) unless federally authorized.
- Glock switches manufactured after 1986 are illegal for civilians without special licensing.
- No “intent” requirement: Mere possession — even without installing or using the switch — is illegal.
Penalties for Violation:
- Up to 10 years in prison
- $250,000 fine
- Lifetime prohibition on gun ownership
National Firearms Act (NFA) Section 5845(b)
The NFA defines “machine gun” broadly, covering both full firearms and any conversion devices, including Glock switches.
Legal Definition:
“A machine gun is any weapon that shoots, is designed to shoot, or can readily be restored to shoot automatically more than one shot by a single function of the trigger.”
Why It Matters:
- Conversion devices like Glock switches are included under this law.
- Possessing a switch — even without installing it — is illegal.
- No legal method to register post-1986-made switches for civilians.
Penalties for Violation:
- Federal felony charges
- NFA violation charges
- No legal way to register civilian Glock switches post-1986
When Was the Glock Switch Invented?
The Glock switch, often referred to as an auto sear, was originally developed around the mid-to-late 1990s. It began in underground markets overseas before appearing in the United States.
Though Glock itself did not manufacture these switches, aftermarket manufacturers began producing them illegally, offering minimal modification kits.
Today, thanks to 3D printing and advanced machining, Glock switches have become more accessible — and consequently, far more targeted by law enforcement.
What Happens If You Get Caught with a Switch?
Getting caught with a Glock switch can instantly escalate a minor encounter with law enforcement into a serious federal case.
Key Steps Once Caught:
- Immediate seizure of all firearms and devices.
- Detainment pending investigation.
- Federal indictment under Title 18 § 922(o) and NFA § 5845(b).
- Formal felony charges, court dates, and possible conviction.
A conviction under these charges results in severe, life-changing consequences, including permanent loss of gun rights and significant prison time.
Where Are Glock Switches Legal?
Switches are almost universally illegal for civilian use in the United States. A few highly restricted cases exist where federally licensed dealers or law enforcement agencies can possess them. However, for the average person, Glock switches are illegal across the country.
For a complete guide on where switches might be legal under special licenses, [read our blog: How to Legally Own a Glock Switch].
Why Are Glock Switches Illegal?
Glock switches are illegal primarily for public safety reasons.
Fully automatic weapons, including semi-automatics modified by a switch, are:
- Extremely difficult to control accurately.
- Capable of firing 20+ rounds per second.
- Far more likely to cause accidental injuries or mass casualty events.
Because of these risks, federal lawmakers in the 1930s (through the National Firearms Act) and again in the 1980s (through the Firearm Owners Protection Act amendments) heavily restricted machine guns and related parts.
A Glock switch effectively turns an otherwise civilian-legal pistol into a machine gun, triggering strict federal controls.
How AutoSear.org Can Help You Legally Own a Switch
At AutoSear.org, we are committed to helping firearm owners understand and navigate the complex legal landscape surrounding Glock switches and full-auto conversions.
While civilian ownership of Glock switches is heavily restricted, there are specific legal pathways available, such as:
- Federal licensing (FFL/SOT licensing)
- Special Law Enforcement Demonstrator (SLED) permits
- Restricted-use dealer licenses
We provide information, resources, and guidance to help you explore these options safely and legally.
To learn more about how to legally own a Glock switch, [read our detailed guide: How to Legally Own a Glock Switch].
Conclusion
Owning a Glock switch without the proper legal authorization is a serious federal crime. Penalties are steep, and even possession — without use — can land you in prison for up to 10 years or more.
Understanding the laws — like Title 18 § 922(o) and NFA § 5845(b) — is crucial if you own or plan to modify firearms.
If you want to explore legal ways to own a Glock switch, be sure to check our detailed guide on [How to Legally Own a Glock Switch], and always prioritize safety, legality, and responsibility.
