Final answer:
Since 2014, Walmart has taken steps to restrict gun sales, such as halting sales of certain ammunition, implementing strict background checks, ending handgun sales, and banning open carry in stores.
Step-by-step explanation:
Since McMillon became chief executive in 2014, Walmart has implemented several steps to restrict gun sales. These include halting sales of certain types of ammunition, implementing strict background checks for gun buyers, ending sales of handguns, and banning open carry in their stores. These measures aim to address concerns about firearm violence and ensure the safety of customers and employees.