Firearms

Gary Kleck on the Effect of Large-Capacity Magazines on the Casualty Counts in Mass Shootings

As noted previously, one of the three papers on the recent American Society of Criminology panel for which I was the discussant was by the distinguished criminologist Gary Kleck.

External-Funding-Gary-Kleck-New-Website

Every time there is a mass shooting in America, some people look to ban large-capacity magazines in order to prevent similar tragedies from happening in the future. Cases in point: Colorado’s ban on magazines larger than 15 rounds following the Aurora theater shooting, and the New York SAFE Act’s post-Sandy Hook ban on magazines which hold more than 7 rounds of ammunition.

This led Kleck to ask whether bans on large-capacity magazines would have made a difference in the casualty counts of past mass shootings.

Note: This assumes, of course, that a large-capacity magazine ban would keep large-capacity magazines out of the hands of individuals who commit mass shootings – not a safe assumption at all, but one which Kleck allows for purposes of argument.

ComeAndTakeIt-Mag

For this paper, Kleck identified and examined 88 mass shooting incidents in which more than six people were killed or wounded for the 20 year period from 1994 through 2013. He looked at incidents with more than six victims because six or fewer people could be shot with a traditional six-shot revolver with no large-capacity magazine needed. So he wanted to look at those events in which possession of large-capacity magazines would be most relevant.

Even with this restrictive definition of a mass shooting, Kleck found that large capacity magazines – defined as holding over 10 rounds – were used in only 21 of the 88 incidents (24%). So, in 76% of the incidents, a large-capacity magazine ban would have made no difference in any event.

Kleck then goes on to analyze further the 21 incidents in which a large-capacity magazine was used. In every case, the shooters carried either multiple guns or multiple magazines. Therefore, even without a large-capacity magazine, the shooters could easily switch guns or magazines.

Kleck also marshals evidence to show that the rate of fire of most mass shooters is so slow that having to change guns or magazines more frequently would not diminish their casualty counts.

There is much more detail in this 60+ page paper than I can recount here. I expect that Kleck will be publishing it soon for all to see.

For now, the bottom line is this: large-capacity magazines do not lead to higher casualty counts in mass shootings. It is the desire of the perpetrator to shoot a lot of people leads to higher casualty counts. The choice of a large-capacity magazine may reflect that desire, but it does not seem to facilitate its realization. Lacking large-capacity magazines, the shooters could realize their evil intentions with other widely available means.

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24 thoughts on “Gary Kleck on the Effect of Large-Capacity Magazines on the Casualty Counts in Mass Shootings

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  8. There was that guy in Cumbria, England 2010 who shot 30+ people in a single day with a break-action shotgun (can’t recall if it was a single shot or double barrel) and a .22lr rifle. He took his time throughout the day.

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  12. Where is the actual article? Half of the years included were during the original gun ban from 1994-2004. Wouldn’t that have had an effect? Also, only oncluding those with 6 or more fatalities based on number of rounds assumes that the shooter has 100% accuracy. What 88 did he include & why? I have been focusing on only those that are not gang or crime related. How many did the entire 88 kill vs the 21? Why was this not reported on?

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    • The article is not yet published. I read it as the discussant on a panel at the American Society of Criminology. It is quite detailed, over 60 pages long, so most of your questions are answered in the paper. Once it is published I will post an update.

      I don’t believe the original assault weapon ban would have an effect on this analysis since the studies I have read never find the assault weapons ban to have any effect on anything. There were so many of the rifles already in circulation, and the ban was so easy to circumvent, it was as if it never existed.

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  15. Most Demcrats are anti gun lovers, I’am making the proposal for everyone to change their political affiliation to Republican. I have been a Democrat for over 40 years and I’am embarrassed by their stupidty . Most Repubicans are pro gun and we need to get more of them in office. This is easy to do and will shock the Democrat party.
    SPREAD THE WORD……..

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