| Total Incidents | 242 |
| Assault Weapons | 100 (used in 28% of all shootings cataloged here) |
| Mass shootings involving assault weapons account for 38% of all deaths and 65% of all wounded in attacks cataloged here. | |
| High-Capacity Magazines | 174 (used in 48% of all shootings cataloged here) |
| Mass shootings involving high-capacity magazines account for 60% of all deaths and 86% of all wounded in attacks cataloged here. |
Guns Used in the Deadliest U.S. Mass Shootings
The following database compiles all of the firearms used, or later recovered by law enforcement, in the country’s deadliest mass shootings using publicly available reporting and documents. To learn more about our methodology and definitions, including how we define assault weapons and high-capacity magazines, click here.