In 2015, Walmart ended sales of modern sporting rifles, including the AR-15. We also do not sell handguns, except in Alaska where we feel we should continue to offer them to our customers. Additionally, we do not sell bump stocks, high-capacity magazines and similar accessories. We have a process to monitor our eCommerce marketplace and ensure our policies are applied.
https://corporate.walmart.com/newsroom/2018/02/28/walmart-statement-on-firearms-policy
Walmart sells mini 14s. They’re different than AR15s because they shoot .223 bullets, they’re semi-auto, and you can get 30 round mags all day long. I busted out laughing when I saw one in their display case after the AR ban.