The Illinois Supreme Court heard arguments this week in a case challenging Cook County's ban on assault weapons.
Three gun owners say they're law-abiding citizens and only use their firearms for recreation and self-defense.
Edward Ronkowski represents the men. He told the justices the law was too broad, and gave an example of someone buying a rifle. The owner could make sure he was in compliance with the ordinance by verifying the gun would accept only a four-round clip.
"The very next day, if somebody in China makes a large-capacity magazine that fits it, you're now a criminal. You're being criminalized for conduct that occurred halfway around the world that you had no responsibility for, and didn't know anything about," Ronkowski said.
Cook County contended the court is not a proper forum to voice opposing views on a policy argument.
An assistant state's attorney instead suggested gun owners should try to influence county commissioners through the political process.
Thanks to Illinois Public Radio