WASHINGTON • The Supreme Court is preparing to hear a gun rights case that could lead to more guns on the streets of New York and Los Angeles and threaten restrictions on guns in subways, airports, bars, churches, schools and other places where people gather.

The case the justices will hear Wednesday comes as gun violence has surged, and it could dramatically increase the number of people eligible to carry firearms as they go about their daily lives. The case centers on New York’s restrictive gun permit law and whether challengers to the law have a right to carry a firearm in public for self-defense.

Gun control groups say if a high court ruling requires states to drop restrictions, the result will be more violence. Gun rights groups, meanwhile, say the risk of a confrontation is precisely why they have a right to be armed for self-defense.

Gun rights advocates hope that the court with a 6-3 conservative majority is poised to side with them. They want the court to say the New York law is too restrictive, as are similar laws in other states. Gun control advocates acknowledge the court’s composition has them concerned about the outcome.

“The stakes really could not be higher,” said Jonathan Lowy, chief counsel at the gun control group Brady.