By Violence Policy Center
Large capacity ammunition magazines are the common thread running through most mass shootings in the United States. Since 1980, there have been at least 110 mass shootings (three or more fatalities not including
the shooter) where the shooter used large capacity ammunition magazines containing more than 10 rounds.
A total of 981 people were killed in these shootings, and 1,328 were wounded. This number is likely a significant undercount of actual incidents as there is no consistent collection or reporting on this data. Even in many high-profile shootings, information on magazine capacity is neither released nor reported. The Violence Policy Center has compiled this list of incidents by analyzing news reports and follow-up investigative reports
on mass shootings. Only shootings in which there is specific information that large capacity magazines were used are included. Columbine shooter armed with Intratec TEC-DC9 assault pistol equipped with high capacity ammunition magazine

Large capacity ammunition magazines are the common thread running through most mass shootings in the United States. Since 1980, there have been at least 110 mass shootings (three or more fatalities not including
the shooter) where the shooter used large capacity ammunition magazines containing more than 10 rounds.
A total of 981 people were killed in these shootings, and 1,328 were wounded. This number is likely a significant undercount of actual incidents as there is no consistent collection or reporting on this data. Even in many high-profile shootings, information on magazine capacity is neither released nor reported. The Violence Policy Center has compiled this list of incidents by analyzing news reports and follow-up investigative reports
on mass shootings. Only shootings in which there is specific information that large capacity magazines were used are included.