incidence of mass shootings, as well as far fewer fatalities in mass shootings: "The incidence of high-fatality mass shootings in non–LCM ban states was more than double the rate in LCM ban states; the annual number of deaths was more than 3 times higher." The study acknowledged that because 69 incidents over a 28-year period was, for statistical purposes, "a relatively small number and limits the power to detect significant associations," it was possible that the magnitude of the effects detected was overestimated. The study authors "did not have the statistical power (and thus did not even try) to determine whether different aspects of the various LCM laws might have differential effects on the incidence of high-fatality mass shootings." A 2020 study, examining fatal mass shootings in the U.S. for the period 1984–2017, found that, when controlling for other variables, LCM bans, and handgun purchaser licensing laws, were associated with a significant reduction in fatal mass shootings, while assault weapon bans, background checks, and de-regulation of civilian concealed carry were not. See also Assault weapons legislation in the United States Gun laws in the United States by state Gun politics in the United States Bullet button References Further reading Large Capacity Magazines - summary of U.S. state laws from the Giffords Law Center to Prevent Gun Violence Gun politics in the United States United States firearms law