The final paragraph:
“Several red states, including Florida, are considering legislation designed to halt the use of such codes, so this issue isn’t going away anytime soon. In fact, the Florida bill would make it a felony to assign a merchant category code “or otherwise classify a merchant that is a seller of firearms or ammunition separately from general merchandise retailers or sporting goods retailers”, so things could get very interesting in the near future as companies like Visa are forced to choose between following the edicts of the International Standards Organization or complying with Florida state laws.”
This state law should be pushed through on revenue alone. These stores will see increased sales from unprotected states.