Ban Assault Weapons and High-Capacity Ammunition Magazines

Semi-automatic AR-15 rifles are displayed at a store in Utah, February 2018.

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What is an assault weapon? Assault weapons are generally defined as semi-automatic firearms that are capable of accepting a detachable magazine and that have an additional military-style feature, such as a pistol grip, folding stock, detachable stock, barrel shroud, or threaded barrel.

What is a high-capacity magazine? A high-capacity magazine is generally defined as an ammunition-feeding device capable of accepting more than 10 rounds.

Assault weapons and high-capacity magazines dramatically increase the lethality of shootings, leading to more people being shot and more fatalities.

    • A review of mass shootings between January 2009 and July 2015 found that 155 percent more people were shot and 47 percent more were killed when assault weapons or large-capacity magazines were used.1

These weapons of war are not only used in mass shootings. A 2017 study estimated that, together, assault weapons and guns equipped with high-capacity magazines account for up to 36 percent of guns used in crime.2


  1. Everytown for Gun Safety, “Analysis of Recent Mass Shootings” (2015), available at
  2. Christopher S. Koper and others, “Criminal Use of Assault Weapons and High-Capacity Semiautomatic Firearms: an Updated Examination of Local and National Sources,” Journal of Urban Health (2017): 1-9, available at