The Delaware Supreme Court reinstated House Bill 451, allowing the state to restrict most firearm purchases and possession by people ages 18 to 20, after reversing a lower court ruling that had struck down the law.

Delaware’s new permit-to-purchase handgun law takes effect Sunday after a federal judge denied an injunction, and multiple gun-rights groups, including DSSA, Bridgeville Rifle & Pistol Club, and BKK Firearms, have filed an appeal.