Second Amendment

Defending Its AR-15 Ban, Cook County Urges SCOTUS To Ignore the Rifle's Popularity

Even if AR-15s are covered by the Second Amendment, the county's brief says, that doesn't mean Americans have a right to own them.

Jacob Sullum | 10.22.2026 5:15 PM

Share on FacebookShare on XShare on RedditShare by emailPrint friendly versionCopy page URL Add Reason to Google

Media Contact & Reprint Requests

(Ultraone/Sean Pavone/Dreamstime/Fatima Ruiz)

On December 2, the Supreme Court will consider constitutional challenges to "assault weapon" bans in Connecticut and Cook County, Illinois, that cover widely owned rifles, including the AR-15. As the plaintiffs in those consolidated cases see it, such laws plainly violate the Second Amendment because they prohibit arms in common use for lawful purposes. In briefs filed on Wednesday, Connecticut and Cook County urge the justices to reject that test, saying a weapon's popularity is not dispositive. The relevant question, they say, is whether their rifle restrictions fit a historical tradition of banning "unusually dangerous weapons."

Cook County and Connecticut have the burden of showing that their laws are "consistent with this Nation's historical tradition of firearm regulation," the test established by the Supreme Court's 2022 decision in New York State Rifle & Pistol Association v. Bruen. On the face of it, that is a daunting challenge.

In the 2008 case District of Columbia v. Heller, the Supreme Court said the Second Amendment protects the right to own "bearable arms" that are "in common use" for "lawful purposes like self-defense." That description indisputably encompasses "AR-15 platform and similar semiautomatic rifles," the firearms at issue in these cases. But Heller also recognized "the historical tradition of prohibiting the carrying of 'dangerous and unusual weapons.'" Cook County and Connecticut argue that the rifles they have deemed intolerable fall into that category.

"There is a robust historical tradition of regulating unusually dangerous weapons that
compromise public safety," Cook County says. "Such regulations, which long
predate the founding, have included outright bans and other restrictions on exceptionally dangerous weapons like launcegays, trap guns, Bowie knives, and slung shots."

Cook County argues that its ordinance is "relevantly similar" to those historical restrictions because it targets "exceptionally lethal weapons that are disproportionate to the end of self-defense." AR-15s are "offensive weapons of war designed for maximum lethality and are not customarily used for self-defense," the brief says. "The purpose and operation of the ban is consistent with our Nation's historical tradition and accounts for the exceptional dangerousness of these technologically advanced weapons."

The ban is "an appropriate contemporary restriction implemented by the legislature in response to dramatic technological change and unprecedented societal concern," the brief says. "It is tailored to respond to the particular dangers presented in areas with mass casualty exposure and acute public safety risk."

Connecticut offers a similar argument. One problem with this defense is the premise that "assault weapon" bans focus on "exceptionally lethal weapons." As critics of such laws have been pointing out for decades, the features they target, such as........

© Reason.com