Requiring the Department of State Police to create and maintain a Maryland Voluntary Do Not Sell Firearm Registry in which a person may voluntarily enroll for the purpose of being prohibited from obtaining a firearm; prohibiting a dealer or other person from selling, renting, loaning, or transferring a firearm to a purchaser, lessee, borrower, or transferee who the dealer or other person knows or has reason to believe is registered on the registry; etc.