Use of Inexpensive Devices Turning Pistols into Machine Guns Drives Increase in Mass Shooting Fatalities

Cheap add-on devices called "switches" enable semiautomatic handguns to function like fully automatic weapons.
Switches are contributing to the rise in lethal mass shootings as they allow multiple bullets to be fired with one trigger pull.
Switches are becoming more accessible, especially to young people, leading to their increased use in shootings.
Law enforcement is challenged to address the proliferation of switches due to ease of manufacture, installation and lenient penalties.
Survivors of switch-involved shootings often sustain more severe injuries compared to other mass shootings.