Every mass shooting in the United States is inevitably followed by a call for gun control, but major legislation never passes. We look at how the National Rifle Association became a powerful lobbying group. Also, a gun store owner talks about putting military-style weapons into the hands of civilians. Guests: Robert Draper, a writer at large for The New York Times Magazine; John Markell, the owner of a gun store in Roanoke, Va. For more information on today’s episode, visit nytimes.com/thedaily.

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