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The U.S. Supreme Court is preparing to tackle a Second Amendment question gun owners have waited years to see answered: Can the government ban AR-15s and similar semiautomatic rifles?

Gun Owners of America calls Viramontes v. Cook County the most important Second Amendment case since NYSRPA v. Bruen. That is a bold assessment, but the potential stakes back it up. Depending on how broadly the justices rule, the case could determine the future of so-called “assault weapons” bans across the country.

GOA and the Gun Owners Foundation recently filed a friend-of-the-court brief supporting the challengers. They were joined by a long list of gun-rights organizations and several firearms manufacturers, including Century Arms, CANiK USA, B&T USA and Fostech.

The Case in Plain English

Cook County, Illinois, prohibits the acquisition, transfer and possession of a range of semiautomatic firearms it classifies as “assault weapons.” That includes AR-15-pattern rifles and other magazine-fed rifles possessing certain features.

The challengers argue that these are ordinary semiautomatic rifles owned by millions of Americans for lawful purposes. Cook County maintains that it may legally prohibit them.

The Seventh Circuit rejected the challenge by relying on its earlier decision in Bevis v. City of Naperville. In that case, the appeals court concluded that AR-15s were not materially different from M16 rifles and fell on the “military” side of a line the court drew between civilian and military arms.

The Supreme Court agreed to hear Viramontes on June 30. It also consolidated the case with Grant v. Higgins, a challenge to Connecticut’s similar restrictions. According to the Supreme Court docket, oral arguments are scheduled for December 2, 2026.

The official question is refreshingly direct: “Whether the Second and Fourteenth Amendments guarantee the right to possess AR-15 platform and similar semiautomatic rifles.”

GOA’s Common-Use Argument

GOA’s first argument is the simplest: AR-15s and similar rifles are unquestionably in common use.

In District of Columbia v. Heller, the Supreme Court held that the government cannot ban firearms commonly possessed for lawful purposes. GOA argues that this principle should settle the case without a complicated historical detour.

The brief points to prior Supreme Court language describing semiautomatic rifles as widely accepted lawful possessions. It also notes that the Court unanimously described the AR-15 in Smith & Wesson Brands v. Mexico as “the most popular rifle in the country.”

Tens of millions of these rifles are estimated to be in private hands. As GOA sees it, politicians and judges do not get to call such a widely owned firearm “unusual” simply because they dislike it.

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“If this Court is satisfied that tens of millions (or more) AR-15s and other semiautomatic rifles constitute being in ‘common use,’ then nothing more is needed to strike the bans under review,” the brief argues.

That is the brass-tacks version of GOA’s position: Americans already made their choice, and that choice was the AR-15.

What Does “Dangerous and Unusual” Mean?

GOA also wants the Court to clean up the phrase “dangerous and unusual.”

Gun-control advocates frequently use that language to argue that certain firearms fall outside the Second Amendment. GOA counters that the historical regulations behind the phrase dealt with people carrying or displaying weapons in a threatening manner that disturbed the peace.

In other words, those laws punished conduct. They did not outlaw merely possessing an entire class of arms at home.

GOA argues that stretching those old restrictions into support for a modern ban on ownership badly misses the mark. According to the brief, there is no comparable historical tradition of banning the purchase and possession of a firearm simply because the government considered it especially dangerous.

The Military-Rifle Question

Then there is the M16 comparison.

An AR-15 fires one round with each pull of the trigger. An M16 can fire automatically. GOA argues that treating the two as interchangeable ignores an obvious mechanical and legal distinction.

At the same time, the brief says that even if AR-15s shared more characteristics with military weapons, that would not automatically remove them from constitutional protection. GOA points to the Second Amendment’s militia language and argues that the Founders expected citizens to possess arms suitable for militia service.

Still, GOA urges the justices not to let this case wander into a broader debate about machine guns. The rifles directly before the Court are semiautomatic, and the organization believes the cleaner path is to recognize them as bearable arms in common lawful use.

Why This Case Matters

A narrow ruling could resolve only the Cook County and Connecticut disputes. A broader decision could establish a national test that knocks down similar bans in other states and cities.

The Court could also finally tell lower courts whether they may uphold rifle bans by comparing semiautomatic firearms to military weapons, or by labeling commonly owned rifles “dangerous and unusual.”

Nothing has been decided yet. GOA’s brief is an argument supporting the challengers, not a ruling from the Court. Cook County and Connecticut will have their opportunity to defend the laws before the justices hear the case in December.

For gun owners, however, the central question could hardly be clearer: Does the Second Amendment protect the country’s most popular rifle?

After years of lower courts talking around that question, Viramontes may finally deliver an answer.

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