A person who seeks to own a regulated firearm and purchases the regulated firearm from an out-of-state federally licensed gun importer, manufacturer, or dealer shall: have the federally licensed importer, manufacturer, or dealer ship the regulated firearm to a licensee for processing; and comply with §§ 5-103, 5-104, 5-117 through 5-129, and 5-136 of this subtitle. If a person purchases a regulated firearm for use within the scope of the person’s official duties, the Secretary may waive the 7–day waiting period under § 5–124 of this subtitle for: law enforcement personnel of any unit of the federal government; members of the armed forces or the National Guard; or law enforcement personnel of the State or any local agency in the State.