The U.S. Justice Department on Monday proposed cracking down on accessories that can be used to convert pistols into rifles and released model legislation to help states prevent guns from getting into the hands of the mentally ill, as part of a broader push to reduce gun violence.

The two measures are part of a series of steps the Biden administration previously pledged to take, as mass shootings have continued to plague the United States. In 2021 alone, the country has had 254 mass shootings, according to data compiled by the Gun Violence Archive.

“The Justice Department is determined to take concrete steps to reduce the tragic toll of gun violence in our communities,” Attorney General Merrick Garland said in a statement.