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.

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