A decades-old U.S. government ban on federally licensed firearms dealers selling handguns to adults under the age of 21 is unconstitutional, a U.S. appeals court held on Thursday, citing recent U.S. Supreme Court rulings expanding gun rights.

A conservative federal appeals court said Thursday that a federal law banning the sale of handguns to 18- to 20-year-olds is unconstitutional, elevating a significant question about the Second Amendment’s reach in the wake of recent major Supreme Court rulings on gun rights.

The ruling by the U.S. Court of Appeals for the Fifth Circuit applied the Supreme Court’s “historical tradition” test.