Various firearms matters.

Requires a person wishing to sell, trade, or transfer (transfer) a firearm to another person to transact the transfer through a dealer and provide the dealer with certain information. Specifies the background checks that a dealer must complete prior to the transaction. Permits a dealer to refuse to transact a firearm transfer. Requires a dealer to abort the transaction in other instances. Specifies requirements for a dealer who refuses to transact or aborts a firearm transfer. Makes a dealer immune from civil liability and damages in certain instances. Makes the offenses of firearm transfer fraud and the unlawful transfer of a firearm Level 6 felonies. Enhances both offenses in particular instances. Specifies exceptions and defenses. Requires a retail dealer to display a sign with language stating that failing to secure a firearm against unauthorized access poses a safety risk to children. Prohibits a licensed importer, licensed manufacturer, licensed dealer, or licensed collector from selling or delivering a: (1) firearm that is not a handgun to a person who is less than 21 years of age; or (2) semiautomatic assault weapon. Defines terms.