SECTION 16-23-20. Unlawful carrying of handgun; exceptions.(9) a person in a vehicle if the handgun is secured in a closed glove compartment, closed console, closed trunk, or in a closed container secured by an integral fastener and transported in the luggage compartment of the vehicle; however, this item is not violated if the glove compartment, console, or trunk is opened in the presence of a law enforcement officer for the sole purpose of retrieving a driver's license, registration, or proof of insurance;
SC law is less strict, you are not using federal law to put your gun in your glove box in SC. SC law is less strict, therefore the federal law isn't needed here.SigP229 said:A provision of federal law serves as a defense to state or local laws which would prohibit the passage of persons with firearms in interstate travel.
Notwithstanding any state or local law, a person shall be entitled to transport a firearm from any place where he may lawfully possess it to any other place where he may lawfully possess such firearm if the firearm is unloaded and in the trunk. In vehicles without a trunk, the unloaded firearm shall be in a locked container other than the glove compartment or console. Necessary stops, like gasoline and rest, seem permissible.