Gun control advocates lauded the move.
"Walmart deserves enormous credit for joining the strong and growing majority of Americans who know that we have too many guns in our country, and they are too easy to get," Guns Down America founder Igor Volsky, who is also the group's executive director, said in a statement.
However, the National Rifle Association called Walmart's decision "shameful."
"The truth is Walmart's actions today will not make us any safer," the NRA said in a statement. "Rather than place the blame on the criminal, Walmart has chosen to victimize law-abiding Americans. Our leaders must be willing to approach the problems of crime, violence and mental health with sincerity and honesty."
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– The Associated Press contributed to this report.