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Researchers estimate that if the federal law prohibiting assault weapons and high-capacity magazines was in effect from 2005 through 2019, it would have prevented 30 mass shootings that resulted in 1,478 people shot and killed or wounded.

Lori Post et al., “Impact of Firearm Surveillance on Gun Control Policy: Regression Discontinuity Analysis,” JMIR Public Health and Surveillance 7, no. 4 (2021): e26042, Study defined mass shooting as four or more victims killed with a firearm at a public location. Familicides and felony killings were excluded. 

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