Requiring a federal firearms licensee or law enforcement agency operating a gun buyback program to destroy each firearm and all its components and parts, that is traded in as part of a gun buyback program; authorizing a certain person or entity to contract with a law enforcement agency or a business to destroy certain firearms; requiring a law enforcement agency operating a gun buyback program to make certain efforts to determine whether a firearm is a crime firearm or has been reported lost or stolen before destroying the weapon; etc.