I gathered some more examples [of armed citizens stopping mass shootings] from over the years here, and then followed up with data based on FBI reports of mass shootings in 2016 and 2017: legal civilian gun carriers tried to intervene in 6 out of 50 incidents, and apparently succeeded in 3 or 4 of them.
The FBI also has 2021 data (I don’t expect the 2022 data until later this year).
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