This. Nobody carries out a mass shooting with a bolt-action rifle.
In terms of Richard's nostalgic view of history, it's important to realize that the proliferation of the AR platform and other semi-automatic "sporting" rifles in civilian hands didn't really begin until the 1990's. And they didn't truly take off in popularity until 2008, when Obama was elected and fears of never-realized "gun bans" sent sales skyrocketing and put millions of these weapons into civilian circulation. So you can actually plot the proliferation of semi-automatic weapons with detachable high-capacity magazines with the incidence rate of mass shootings and you'll see them trend upwards at the same time.
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