By Leslie M. Barnard; Erin Wright-Kelly; Ashley Brooks-Russell; et al

  Mass shootings (MS) account for less than 1% of firearm deaths in the US, but the frequency has increased.1 Risk factors for MS perpetration include societal discrimination, contagion effects, firearm access, mental illness, and substance abuse.2 Previous geographically and analytically limited studies found MS with handguns had higher fatality rates than those with rifles,3 and following an age-based assault weapons (AWs) restriction there was a reduction in firearm violence from AWs.4 Another study found that the 1994 federal AWs ban was associated with fewer MS.5 To further investigate the association between type of firearm and lethality of MS, this study examined what firearms were present at publicly targeted fatal MS and determined if AWs were associated with a higher number of injuries or deaths.

JAMA Netw Open. 2025;8(2):e2458085. doi:10.1001/jamanetworkopen.2024.58085 4p.

By: Azrael, Deborah and Blocher, Joseph and Cook, Philip J. and Hemenway, David and Miller, Matthew,

For a paper that has not yet been through peer review or even been formally published, William English’s "2021 National Firearms Survey" has been remarkably prominent in gun rights advocacy and scholarship. As of June 2024, it has been cited in roughly 50 briefs, invoked at oral argument in the Supreme Court and multiple courts of appeals, and regularly cited in public writings and published academic work.

This response is offered in the spirit of a peer review. Our focus is on methodological issues, questionable statistical results, and problematic conclusions. Because of serious methodological issues, the draft fails to provide a reliable estimate of the number of defensive gun uses, the stock of AR-15s, or the actual protective value of or frequency with which AR-15 type firearms have been used. The paper should not be used as an authoritative source.

Duke Law School Public Law & Legal Theory Series No. 2024-50