we're the kirby family, and we are usaa members for life. get your auto insurance quote today. let's start with a question. how do you know when any gun control pressure out there is working if the united states senate blocks most of the attempts to get congress to act? well, tonight, here's a new sign of some shift. the largest retailer in the united states, walmart, pulling back on some gun sales and halting ammunition sales for assault-style rifles and handguns. and this store popular across the south and midwest is also drawing a line by banning its own customers from opening carrying when they shop inside walmart. the decision comes in the wake of two deadly shootings at walmart stores last month, including the shooting at the el paso store, which was one of the deadliest mass shootings in american history. this weekend, there was another shooting rampage, this time in west texas with seven people killed.