US credit card giants said they will implement a new merchant category code for the nation's gun retailers, which gun control activists say will help flag potential mass shooters and gun traffickers. More: https://www.cbsnews.com/boston/news/credit-card-companies-will-adopt-new-sales-code-for-gun-transactions/?intcid=CNM-00-10abd1h #cbsnewsmiami #news #gun #gunlaws #credit #creditcard #weapons