Walmart announced Tuesday it is ending the sale of some types of ammunition, and is “respectfully requesting” that shoppers stop openly carrying firearms into its stores, even in states where it’s legal.

The changes were revealed in an open letter from CEO Doug McMillon to employees, and comes in the wake of several mass shootings — including one last month at an El Paso, Texas, Walmart that left 22 people dead.

“It’s clear to us that the status quo is unacceptable,” wrote McMillon.

“We are respectfully requesting that customers no longer openly carry firearms into our stores … in states where ‘open carry’ is permitted — unless they are authorized law enforcement officers,” wrote McMillon.

The CEO attributed that policy not to the mass shooting itself, but “multiple incidents since El Paso where individuals attempting to make a statement and test our response have entered our stores carrying weapons in a way that frightened or concerned our associates and customers.”

McMillon did not characterize the change as a ban, and said the chain’s policy regarding legal concealed firearms was not changing.

“We will treat law-abiding customers with respect, and we will have a very non-confrontational approach,” wrote McMillon.

Additionally, Walmart announced that it would discontinue the sales of .223 and 5.56 rifle rounds, as well as handgun ammo, after selling its current stock.

“We know these decisions will inconvenience some of our customers, and we hope they will understand,” wrote McMillon, also referencing a shooting at a Southaven, Mississippi, location just days before El Paso that left two workers dead. “As a company, we experienced two horrific events in one week, and we will never be the same.”