Possessing a Glock switch is a federal felony with a sentence of up to 10 years in prison and a fine as high as $250,000. A first-time defendant with no meaningful criminal record is usually looking at an advisory guideline range of 27 to 33 months. That range rises with prior convictions, with the number of firearms involved, and with any link to another felony. If the switch is tied to a violent crime or drug trafficking, a separate 30-year mandatory minimum takes over.
Why Possession Alone Is a Federal Felony
A Glock switch attaches to the back of a Glock pistol and converts it to fully automatic fire. Federal law treats the switch itself as a machine gun. The National Firearms Act defines a machine gun to include “any part designed and intended solely and exclusively… for use in converting a weapon into a machinegun.”1Bureau of Alcohol, Tobacco, Firearms and Explosives. National Firearms Act, 26 USC Chapter 53 A switch sitting in a drawer, with no pistol attached, is already an illegal, unregistered machine gun in the government’s view. The material it’s made from (metal, polymer, 3D-printed) does not change the classification.2Bureau of Alcohol, Tobacco, Firearms and Explosives. U.S. Attorney and ATF Release New Public Service Announcement Warning Against Possession of Machine Gun Conversion Devices
There is no civilian registration route. Federal law has banned civilian possession of any machine gun not lawfully owned before May 19, 1986.3Office of the Law Revision Counsel. 18 US Code 922 Every Glock switch in existence was made after that date, so none can be legally registered or transferred to a civilian owner.
What a First Offense Typically Looks Like
Federal judges work from the U.S. Sentencing Guidelines, which produce an advisory range based on an offense level and a criminal history category.4United States Sentencing Commission. An Overview of the Federal Sentencing Guidelines
For a firearm covered by the National Firearms Act, the base offense level is 18 for a defendant without prior felony convictions involving violence or controlled substances.5United States Sentencing Commission. USSG 2K2.1 – Unlawful Receipt, Possession, or Transportation of Firearms or Ammunition At level 18 with Criminal History Category I, the 2025 sentencing table calls for 27 to 33 months.6United States Sentencing Commission. 2025 Sentencing Table
Criminal history shifts that range quickly:
- Category I: 27 to 33 months
- Category II: 30 to 37 months
- Category III: 33 to 41 months
- Category IV: 41 to 51 months
- Category V: 51 to 63 months
- Category VI: 57 to 71 months
Defendants whose records include prior felonies for violence or controlled substances start above level 18 before any other adjustments, which pushes the range higher still.
The guidelines are advisory, so a judge can go above or below the calculated range. In practice, most sentences land inside it or close to it.
What Pushes the Sentence Up
Several common adjustments add offense levels to the base of 18, and each added level shifts the range upward.
The number of firearms matters. Three to seven firearms adds 2 levels. Eight to 24 adds 4. Larger quantities add more.5United States Sentencing Commission. USSG 2K2.1 – Unlawful Receipt, Possession, or Transportation of Firearms or Ammunition A defendant caught with a handful of switches is already at level 20 or 22 before anything else is counted.
Possessing the switch “in connection with” another felony adds 4 levels, with a floor at level 18 even for defendants who would otherwise start lower.5United States Sentencing Commission. USSG 2K2.1 – Unlawful Receipt, Possession, or Transportation of Firearms or Ammunition Obliterated serial numbers, a leadership role in a group offense, and obstruction (such as destroying evidence or lying to agents) are the other enhancements that show up most often.
What Pulls It Down
The most reliable reduction is acceptance of responsibility. A guilty plea that genuinely accepts responsibility knocks 2 levels off the offense level. Pleading early enough to spare the government trial preparation adds 1 more level, for a total of 3.7United States Sentencing Commission. Amendment 775 For a defendant starting at 18 with no enhancements, that drops the level to 15 and brings the Category I range down accordingly. This is where most plea negotiations in these cases happen, and it’s a major reason the overwhelming majority of federal firearms defendants plead rather than go to trial.
When the 30-Year Mandatory Minimum Applies
Everything above describes a standalone possession case. The analysis changes completely if the machine gun is tied to a violent crime or a drug trafficking offense. That isn’t a sentencing enhancement; it’s a separate federal count under 18 U.S.C. § 924(c), with its own mandatory minimum stacked on top of the sentence for the underlying crime.
For a first § 924(c) count involving a machine gun, the mandatory minimum is 30 years. The judge cannot go lower. A prior § 924(c) conviction that has already become final, followed by a new machine gun count, triggers a mandatory life sentence.8Office of the Law Revision Counsel. 18 US Code 924 – Penalties
These sentences run consecutively, not concurrently, with the sentence for the underlying drug or violent offense. A defendant convicted of drug trafficking plus a § 924(c) machine gun count faces a combined minimum well north of 30 years.
Added Exposure for Switches Bought From Overseas
Many switches enter the country through online orders from foreign sellers. Receiving one in the mail is enough to add a federal smuggling charge to the machine gun count. The smuggling statute carries a maximum of 20 years in prison, along with fines and forfeiture of the goods.9Office of the Law Revision Counsel. 18 US Code 545 – Smuggling Goods Into the United States The smuggling and machine gun sentences can run consecutively.
What Follows the Prison Term
A federal machine gun conviction carries consequences that outlast the prison sentence.
Any firearm connected to the offense is subject to forfeiture, including the pistol the switch was meant for and any other guns tied to the violation.8Office of the Law Revision Counsel. 18 US Code 924 – Penalties
After release, the defendant serves supervised release. For a Class C felony like machine gun possession, the maximum term is 3 years, with court-imposed conditions that typically include drug testing and travel restrictions. Violating the conditions can send the defendant back to prison.10Office of the Law Revision Counsel. 18 US Code 3583 – Inclusion of a Term of Supervised Release After Imprisonment
The felony conviction itself produces a lifetime firearms ban. Any federal felony permanently prohibits the defendant from possessing any firearm or ammunition, of any kind, forever.3Office of the Law Revision Counsel. 18 US Code 922 Possessing a gun after that point is itself a separate federal felony with its own prison exposure.