What Is a Glock Switch? The Law, Penalties and 2026 Data

Last updated October 24th 2026

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A Glock switch is a small, illegal aftermarket part that fits on the back of a Glock slide and makes the pistol fire fully automatic. Under federal law the switch itself counts as a machine gun, so owning one, even with no gun attached, can mean up to 10 years in federal prison. There is no legal way for a private citizen to buy a new one.

Search “Glock switch” and much of what comes back is people offering to sell you one, from overseas marketplace listings to sites that exist only to move them. That should tell you something about who these pages are written for. This one is for gun owners who want the straight facts: what a switch is, exactly why it’s a felony, how big the problem has become according to ATF’s own numbers, what people are getting sentenced to in 2026, and what Glock changed because of it. We don’t explain how they work inside or how to fit one.

Table of Contents

What Is a Glock Switch?

A Glock switch, also called an auto sear, auto switch, “button” or “chip,” is a conversion device. It’s a part about the size of a thumbnail that replaces or attaches over the plate at the back of a Glock slide. Once it’s on, the pistol keeps firing for as long as the trigger is held, the same way a machine gun does.

They’re cheap to make. Some are machined from metal and smuggled in from overseas, and a growing share are 3D printed at home, like the ones in the ATF photo at the top of this page. On the right of that photo are “swift links,” a similar conversion device made for AR-15 rifles. Federal law treats both the same way.

A switch is not a factory feature and Glock has never made one. The only full-auto pistol Glock builds is the Glock 18, which has its own slide, frame and fire-control parts and is sold only to military and police. A switched Glock is a semi-automatic pistol forced into automatic fire by a part nobody tested with it, and it’s every bit as illegal as a Glock 18 in civilian hands.

Is a Glock Switch Legal? The Law in Plain English

No. Three pieces of federal law do the work:

• The switch is a machine gun. The National Firearms Act defines a machine gun to include “any part designed and intended solely and exclusively” for converting a weapon into a machine gun (26 U.S.C. 5845(b)). That covers the switch by itself, in a drawer, with no gun in sight.
• New machine guns are banned for civilians. 18 U.S.C. 922(o) makes it unlawful to transfer or possess any machine gun that wasn’t lawfully possessed before May 19, 1986, unless you’re a government agency or acting under its authority.
• The penalty is serious. A knowing violation of 922(o) carries up to 10 years in federal prison under 18 U.S.C. 924(a)(2). Prosecutors can also charge possession of an unregistered NFA firearm, and state charges can stack on top.

Ignorance of the label isn’t a defense either. Overseas sellers list switches as “multitool switches,” “screwdrivers” or “keychains.” What a part is designed to do decides what it is, not what the packaging says.

Why a Switched Glock Is So Dangerous

Even setting the law aside, a switched Glock is a bad gun. A factory machine pistol like the Glock 18 fires in the range of 1,100 to 1,200 rounds per minute, and a switched Glock runs in that same territory. That’s close to 20 rounds a second. A standard 15-round Glock 19 magazine is gone in well under a second, faster than most people can let go of the trigger.

A pistol that light can’t be held on target at that rate. Each shot lifts the muzzle before the shooter can bring it back down, so after the first round the rest climb up and to the side. In practice that means rounds going over and past whatever the shooter was aiming at, into walls, cars and the people behind them. Much of the danger lands on bystanders, which is a big part of why prosecutors push switch cases into federal court.

The parts themselves are another risk. A home-printed plastic switch was never designed or tested with the pistol it’s fitted to. Parts wear quickly at that rate of fire, and a worn or poorly made switch can fail in ways that leave the gun firing when it shouldn’t, or not stopping when the trigger is released. Glock designed the Glock 18 with its own slide, frame and fire-control parts precisely because a standard pistol isn’t built for continuous automatic fire.

The 2026 NFA Changes Don’t Touch Switches

Since October 9, 2026, ATF has stopped enforcing NFA approval and registration for suppressors, short-barreled rifles and shotguns, and AOWs. Our ATF NFA guidance explainer covers it in detail. Some people have taken that to mean the NFA is finished. It isn’t, and machine guns were carved out in plain words. ATF’s open letter says “all NFA provisions still apply to machineguns and destructive devices,” and the separate 922(o) ban was never part of the change. A switch is exactly as illegal today as it was a year ago.

How Big the Switch Problem Has Become

ATF’s own trace and recovery data shows switches went from rare to routine in about a decade:

Period	Conversion devices recovered by law enforcement	Source
2012 to 2016	814	ATF National Firearms Commerce and Trafficking Assessment, Vol. 2
2017 to 2021	5,454 (up 570%)	Same report
2019	658	NFCTA final volume
2023	5,816 (up 784% on 2019)	NFCTA final volume
2019 to 2023 total	11,088	NFCTA final volume

Those are only the devices police recovered and reported, so the real number in circulation is higher. The Justice Department’s release on the second volume put the 570% rise front and center.

Most of the metal ones come in by mail. CBP officers at Chicago’s international mail facility seized 1,302 Glock switches in 396 shipments between January and September 2024, most of them from China. At LAX, investigators searched more than 200 mislabeled packages and every one contained switches. And on January 13, 2026, federal authorities in Boston seized two more website domains used to import conversion devices from China, part of an investigation that by then had taken down about 360 domains and seized more than 3,000 conversion devices, 282 firearms and 124 silencers. Prosecutors noted that some of those sites sold counterfeit “Glock” branded switches, though Glock has never made one.

What People Are Getting Sentenced to in 2026

Federal prosecutors treat switch cases as machine gun cases, and the sentences show it. A sample of 2026 cases from U.S. Attorney’s Office announcements:

District	Sentence	What happened
Southern District of Alabama	108 months	Possession of a machine gun conversion device, found in a Glock box under a bed after a fatal shooting (April 2026)
Northern District of Alabama	120 months	Possession of a machine gun, the statutory maximum
Eastern District of Texas	100 months	Armed robbery with a switched pistol (March 2026)
Western District of Texas	40 months	Stolen pistol converted to full auto and fired near a base (April 2026)
Western District of Pennsylvania	36 months	Glock with a conversion device during a drug sale (June 2026)
Northern District of Illinois	24 months	Switched Glock fired into the air during a livestream (July 2026)

Most of those cases started with something else, a traffic stop, a robbery, a drug deal, and the switch turned a state case into a federal one with years added. Others, like this North Carolina case, began with nothing more than a switch found on a gun during a stop.

Switches vs Forced Reset Triggers vs Binary Triggers

A lot of confusion comes from lumping every “fast trigger” together. Legally they’re very different:

Device	What it does	Federal status in 2026
Glock switch / auto sear	Fires continuously while the trigger is held	Machine gun. Illegal for civilians, up to 10 years
Forced reset trigger (AR-15)	Pushes the trigger forward after each shot, still one shot per pull	Legal federally after the May 2025 settlement; banned in a number of states
Binary trigger	One shot on the pull and one on the release	Legal federally; banned in some states

The line federal law draws is whether the gun fires more than one shot automatically with a single function of the trigger. A switch crosses it. Our guide to forced reset triggers covers the settlement, the state bans and which FRTs are worth buying.

How Glock and the States Responded

The switch problem changed Glock itself. Minnesota and New Jersey sued the company in 2024, arguing its design made conversions too easy. In October 2025 Glock stopped making more than 30 models and replaced most of its double-stack line with the “V Series,” which uses a redesigned trigger bar, revised slide rails, a narrower firing pin channel and a modified rear plate, all meant to make switches harder to install. The Gen6 pistols launched in January 2026 carry the same changes. Our Glock 19 Gen6 review covers what else changed.

States moved too. California’s AB 1127, in force since July 1, 2026, bars dealers from selling new pistols that can be readily converted into machine guns. A federal judge declined to block it in August, as our California Glock ban coverage explains. New York passed a design-based Glock ban of its own, now being challenged in federal court, which we cover in our New York Glock ban lawsuit report.

If You Find One or Someone Offers You One

• Don’t buy it, print it or order it. Ordering one online is itself evidence of intent, and packages are being seized and traced back to buyers.
• Don’t install it “to see if it works.” Possession is the crime. Firing it adds more.
• If you find one, in a used gun, an estate or a family member’s things, don’t mail it, sell it or toss it in the trash. Contact local police or ATF and let them take it. ATF’s illegal firearms line is 1-800-ATF-GUNS (1-800-283-4867), listed on its hotlines page.
• If you bought a used Glock and the rear slide plate looks unusual, take it to a gunsmith or your local police before you shoot it.

Buying a Glock in 2026? The Switch-Resistant Models

If you’re in the market for a Glock, the current production pistols are the Gen6 and the V Series, both built with the anti-switch changes above. Here are live prices on the Glock 19, the most popular of them, across the 200+ retailers we track:

For background on the law behind all of this, our explainer on what the National Firearms Act is covers the 1934 law and how it has changed.

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