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DOJ Sues Denver, Colorado Over Gun Bans
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DOJ Sues Denver, Colorado Over Gun Bans

The DOJ filed two Second Amendment lawsuits this week — one against Denver's 'assault weapon' ban, one against Colorado's 15-round magazine limit. Both invoke the Bruen historical tradition test and seek permanent injunctions. The real target may be the Supreme Court's docket.

Steve DuskettMay 11, 2026
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Article Info

DOJ Sues Denver, Colorado Over Gun Bans

Court DecisionDeveloping
DOJ Sues Denver, Colorado Over Gun Bans
Scope
JurisdictionColorado
Impactnational
Key Entities
Assistant AG, Civil Rights Division — filed both complaintsHarmeet Dhillon
Acting Attorney GeneralTodd Blanche
Colorado Attorney General — defending the magazine banPhil Weiser
Denver City Attorney — defending the assault weapon ordinanceMiko Brown
Civil Rights Division unit established to litigate 2A casesDOJ Second Amendment Section
Legal Issues
  • Second Amendment — whether semi-automatic rifles and standard-capacity magazines are 'arms in common use' protected under Heller
  • Bruen historical tradition test — whether any analogous 19th-century law justifies these bans
  • 34 USC 12601 — whether DOJ can use the police-misconduct civil rights statute to challenge firearms regulations
What It Means
  • Colorado residents currently cannot legally buy or possess magazines over 15 rounds — that could change if an injunction is granted
  • Denver residents face possession restrictions on standard-capacity AR-15s and full-size 9mm pistols under the existing ordinance
  • A SCOTUS ruling in either case could invalidate similar bans in California, Illinois, Maryland, Massachusetts, and New Jersey
  • The 34 USC 12601 legal theory, if it holds, gives DOJ a new tool to challenge state and local gun laws nationwide
Timeline
May 6, 2025United States v. Denver filed in U.S. District Court, District of Colorado
May 7, 2025United States v. Colorado filed, challenging statewide magazine ban
June 23, 2022NYSRPA v. Bruen decided — established historical tradition test DOJ is invoking

DOJ Sues Denver, Colorado Over Gun Bans

The Justice Department is using civil rights law to challenge an 'assault weapon' ban and magazine limit — and the legal theory could reach every state with similar laws

From The Boise Gun Club Handbook

The Department of Justice filed two Second Amendment lawsuits this week targeting Denver's 'assault weapon' ban and Colorado's statewide 15-round magazine limit.

Driving the news: Assistant AG Harmeet Dhillon filed United States v. Denver on Tuesday and United States v. Colorado on Wednesday in the U.S. District Court for the District of Colorado. Both suits seek permanent injunctions. Both argue the same thing: these bans cover arms in common use for lawful purposes, and no historical tradition justifies banning them under Bruen.

Catch up quick:

  • Denver's ordinance dates to 1989 and bans any semi-auto pistol or centerfire rifle with a magazine over 15 rounds — which covers standard-configuration AR-15s and most full-size 9mm pistols
  • Colorado's magazine ban, on the books since 2013, bars sale, transfer, or possession of any magazine over 15 rounds statewide
  • The DOJ established a dedicated Second Amendment Section inside the Civil Rights Division last year; these suits are part of that ongoing campaign

By the numbers: The complaints make the "common use" case with hard data.

  • Americans own more than 32 million modern sporting rifles
  • Between 1990 and 2021, Americans bought more than 400 million rifle magazines holding 30+ rounds
  • In 2019, rifles of all types were used in 364 homicides — compared to 6,368 for handguns and 600 for bare hands and feet

The legal hook is unusual: Dhillon is using 34 USC 12601 — the same federal civil rights statute enacted after the Rodney King beating to address police misconduct — arguing that enforcing these bans constitutes a pattern or practice of depriving people of constitutionally protected rights. Denver City Attorney Miko Brown and Colorado AG Phil Weiser both called this a misuse of the statute. They're not wrong that it's a novel application. They may not be right that it fails.

Yes, but: Six federal appellate courts have upheld assault weapon bans and magazine limits since Bruen. Weiser is promising a vigorous defense and has the circuit court record to point to. These cases will almost certainly not end in Colorado.

"The Constitution is not a suggestion and the Second Amendment is not a second-class right. Denver's ban on commonly owned semi-automatic rifles directly violates the right to bear arms." — Acting AG Todd Blanche

What to watch: The Supreme Court is the real audience here. Justices Thomas, Alito, Gorsuch, and Kavanaugh have all signaled openness to striking down assault weapon bans. If either of these cases reaches SCOTUS, it could settle the circuit split that's let these bans survive for years. That's almost certainly the point.

The bottom line: This isn't just about Denver or Colorado. The DOJ is building a vehicle to get magazine bans and semi-auto restrictions in front of a Supreme Court that may finally be ready to bury them.

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