Gun activists in Massachusetts are criticizing Dick's Sporting Goods for the decision to stop selling assault rifles.
The state affiliate of the National Rifle Association says the company's decision was cowardly and divisive.
The suspect in a deadly high school shooting in Florida last month reportedly used an AR-15 assault rifle in the attack.
Sandy Hook shooter Adam Lanza also used one of the assault rifles in the 2012 mass murder at the Connecticut school.
Meantime, Walmart officials announced that it would not sell guns to anyone under the age of 21.