
Similarly, during the 2018 shooting at Marjory Stoneman Douglas High School, students were able to escape down a stairwell while the shooter paused to reload his weapon. The 2011 mass shooting in Tucson, AZ, where six people were killed and 13 others were wounded, including US Representative Gabrielle Giffords, was interrupted when the gunman stopped to reload his weapon and was tackled by a bystander. When shooters have high capacity magazines, more bullets can be fired before this crucial time period for escape or other intervention. The time a shooter takes to reload his weapon can be critical in enabling victims to escape and law enforcement or others to intervene. The shooter in the 2017 Las Vegas massacre was able to fire 100 rounds in just 10 seconds-without having to pause and reload-because he used a large capacity magazine, bump stock, and an assault rifle in his attack which killed 50 and injured hundreds. Using an assault weapon and a drum magazine that held 100 rounds, the assailant in the 2019 Dayton, Ohio mass shooting, was able to fire at least 41 rounds of ammunition in less than 30 seconds, killing nine people and wounding 26 others. Mass shootings that involve large capacity magazines result in twice as many fatalities compared to mass shootings that do not involve high capacity magazines. The more rounds a shooter can fire consecutively, the more gunshot wounds they can inflict during an attack. Large capacity magazines significantly increase a shooter’s ability to injure and kill large numbers of people quickly because they enable the individual to fire repeatedly without needing to reload. In fact, large capacity magazines have been used in all ten of the deadliest mass shootings in the last decade. Large capacity magazines (LCMs or LCAMs) have been used to perpetrate devastation on a massive scale in many high-profile mass shootings.
While large capacity magazines are typically associated with semi-automatic assault weapons or machine guns, such devices can be used with any semi-automatic firearm that accepts a detachable magazine, including handguns. Louis Klarevas, Andrew Conner, and David Hemenway, “The Effect of Large–Capacity Magazine Bans on High–Fatality Mass Shootings, 1990–2017,” American Journal of Public Health 109, no.