Judges on the U.S. Court of Appeals for the Fifth Circuit on Monday weighed whether the U.S. Supreme Court's recently clarified Second Amendment history-and-tradition test altered a challenge to the federal ban on handgun sales to adults under age 21.

The federal government has argued that the Supreme Court's June 21 decision in U.S. v. Rahimi supports the statute's constitutionality. In that ruling, the court said a modern gun law must be in line with the reasons behind analogous founding-era regulations and rejected the notion there must be an exact "historical twin."