WASHINGTON Justice Amy Coney Barrett is just starting to make her mark at the Supreme Court.

On Wednesday, her vote flipped the courts approach to restrictions on attendance at religious services during the coronavirus pandemic. While Justice Ruth Bader Ginsburg was alive, the court had allowed such limits, in California and Nevada, by 5 to 4 votes. After Justice Barrett succeeded her, she joined the courts four most conservative justices to strike down restrictions in New York.

Those same four justices are now on high alert for a promising case in which to expand Second Amendment rights, having written repeatedly and emphatically about the courts failure to take gun rights seriously. Justice Barrett seems poised to supply the fifth vote they need.

A Second Amendment case decided last week by the federal appeals court in Philadelphia is a promising candidate for Supreme Court review, not least because it presents an issue on which Justice Barrett has already taken a stand.

It concerns Lisa M. Folajtar, who would like to buy a gun. But she is a felon, having pleaded guilty to tax evasion, which means under federal law she may not possess firearms.

She sued, arguing that the law violated her Second Amendment rights. A divided three-judge panel of appeals court rejected her challenge, saying that committing a serious crime has consequences. It can lead to losing the right to vote, to serve on a jury or to have a gun.

The ruling adopted the position of the Trump Justice Department. The right to keep and bear arms is analogous to other civic rights that have historically been subject to forfeiture by individuals convicted of crimes, including the right to vote, the right to serve on a jury and the right to hold public office, lawyers for Attorney General William P. Barr told the appeals court.

In dissent, Judge Stephanos Bibas, a former law professor appointed to the court by President Trump (and the author of a scathing decision on Friday rejecting the presidents challenge to the election results in Pennsylvania), wrote that the framers of the Constitution would not have allowed lawmakers to bar felons convicted of nonviolent crimes from owning guns.

Lisa Folajtar asks us to treat her as an equal member of society, he wrote. Though her tax-fraud conviction affects some of her privileges, it does not change her right to keep and bear arms.

Judge Bibas wrote that his analysis had drawn heavily from a dissent last year in a similar case concerning a man convicted of mail fraud.

That dissent was written by Justice Barrett when she was a judge on the federal appeals court in Chicago. The law forbidding people with felony convictions from owning guns, she wrote, should not apply when the crimes in question were nonviolent.

History does not support the proposition that felons lose their Second Amendment rights solely because of their status as felons, she wrote. But it does support the proposition that the state can take the right to bear arms away from a category of people that it deems dangerous.

Voting and jury service are different, she wrote, because those are rights that depend on civic virtue.

The Supreme Court has not issued a major Second Amendment decision since a pair of rulings, in 2008 and 2010, established an individual right for law-abiding citizens to keep guns in their homes for self-defense. Beyond that, the justices have said almost nothing about the scope of the right, and lower courts have sustained many kinds of gun control laws.

Before Justice Barretts arrival, the courts four most conservative justices had repeatedly written that the court should return to the subject of the Second Amendment

In 2017, for instance, Justice Clarence Thomas, joined by Justice Neil M. Gorsuch, wrote that they had detected a distressing trend: the treatment of the Second Amendment as a disfavored right.

For those of us who work in marbled halls, guarded constantly by a vigilant and dedicated police force, the guarantees of the Second Amendment might seem antiquated and superfluous, Justice Thomas wrote. But the framers made a clear choice: They reserved to all Americans the right to bear arms for self-defense.

In June, however, the court turned down some 10 appeals in Second Amendment cases. Since it takes only four votes to grant review, there is good reason to think that the courts conservative wing was unsure it could secure Chief Justice John G. Roberts Jr.s vote.

Justice Barretts arrival changes the calculus. Should Ms. Folajtar appeal to the Supreme Court, it is a good bet that Justice Barrett will find her arguments persuasive.

Still, the 2008 decision, District of Columbia v. Heller, would seem to create a hurdle for Ms. Folajtar. The majority opinion, written by Justice Antonin Scalia, included an important limiting passage, the price of Justice Anthony M. Kennedys crucial fifth vote.

Nothing in our opinion, Justice Scalia wrote, should be taken to cast doubt on longstanding prohibitions on the possession of firearms by felons.

Last year, the court agreed to hear a challenge to a New York City gun-control ordinance. But it ended up dismissing the case in April, after the city repealed the ordinance.

Dissenting from that ruling, Justice Samuel A. Alito Jr. noted that the Heller decision recognized that history supported the constitutionality of some laws limiting the right to possess a firearm, including ones prohibiting possession by felons and other dangerous individuals.

That last phrase, which did not appear in the earlier decision, may be significant. In shifting the focus to dangerousness, it seemed to open the door to the position taken by Justice Barrett.

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Justice Barretts Vote Could Tilt the Supreme Court on Gun Rights - The New York Times