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.

A conservative appeals court ruled that the law, which barred the sale of firearms to adults under 21, was inconsistent with the Second Amendment.