By The Editors

Written by The Editors

Estimated Reading Time: 3 minutes

The fight over “assault weapons” bans reached the Supreme Court’s merits stage on Friday, when the Second Amendment Foundation filed its opening brief arguing the Constitution protects the AR-15. The case is the most consequential gun-rights matter the Court has taken up since Bruen, and a decision could settle whether a dozen states may ban the country’s most popular rifle.

The Case

The Court is hearing two consolidated challenges. The lead case is Viramontes v. Cook County, No. 25-238, joined with Grant v. Higgins, No. 25-566, which targets Connecticut’s ban. The justices granted review on June 30, and the question they agreed to decide is direct: whether the Second and Fourteenth Amendments guarantee the right to possess AR-15-platform and similar semiautomatic rifles.

Friday’s filing is the opening merits brief, not a preliminary skirmish. The petitioners’ brief landed Aug 28, with the respondents’ answer due Oct 21. Argument will follow this term, realistically in the winter, with a decision expected by June 2027. Cook County’s ban, the ordinance at the center of the lead case, dates to 2006.

The Argument

The brief’s core is the “common use” test the Court set in Heller and sharpened in Bruen. Under that framework, arms commonly used by law-abiding citizens for lawful purposes are protected, and the government cannot ban them based on a judicial assessment of their dangerousness.

The petitioners’ claim is that AR-15-style rifles are not exotic. They are ordinary. The brief states that roughly 26 million Americans own an AR-15 or a similar semiautomatic rifle, with about 22 million owning AR-15-platform rifles specifically, and that more than 32 million AR-15-platform rifles were produced for the U.S. market between 1990 and 2023. A rifle owned by tens of millions and legal in the large majority of states, the argument runs, is the definition of an arm in common use. The brief calls the AR-15 the most popular rifle in American history.

The legal move is to deny the states any middle ground. If the rifle is in common use, the historical inquiry is over, and the ban falls. There is no interest-balancing step where a legislature gets to weigh the weapon’s utility against its risks. That is the Bruen structure, and the petitioners are asking the Court to apply it without flinching.

Who Is Behind It

The challenge is a coordinated effort by the gun-rights movement’s litigation arms. The Second Amendment Foundation and the Firearms Policy Coalition are lead petitioners, joined by individual gun owners and, in the Connecticut case, the Connecticut Citizens Defense League. Lead counsel is David Thompson of Cooper and Kirk, the firm that has argued many of the movement’s marquee cases.

Second Amendment Foundation founder Alan Gottlieb framed the stakes in the group’s announcement, saying lawmakers “have long relied on fearmongering to pass laws infringing on the Second Amendment, especially regarding common, semi-automatic rifles.”

What Is At Stake

Eleven states generally ban AR-15-platform and similar rifles. A ruling for the petitioners would void those bans and foreclose new ones, settling a question that has splintered the lower courts since Bruen. A ruling the other way would let the bans stand and hand legislatures a durable path to prohibit a class of common firearms.

There is a live debate about how the Court should treat weapons that legislatures deem uniquely dangerous, and it deserves an honest hearing rather than a caricature. States argue that military-style features change the constitutional calculus. The petitioners answer that “dangerous” is exactly the judgment Heller took away from judges when the weapon is in the hands of ordinary civilians.

The number that decides this case is 26 million. If a rifle owned by that many law-abiding Americans is not “in common use,” the phrase means nothing, and the Second Amendment protects only the arms a legislature is willing to tolerate. The Court agreed to answer the question. By next summer, the country may know whether the most popular rifle in its history is a constitutional right or a legislative permission.

Liberty · Upstream of the Swamp · August 31, 2026

-The Editors

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