Guns weren't always the contentious issue they are today in the US. Forty years ago, guns were primarily used for sport and recreation, and mass shootings were a rarity. Much has changed since then, and while there's a lot of debate around how to put an end to gun violence, there has yet to be a solution that everyone can agree on. Gun safety advocate David Farrell thinks he has the answer, and takes us through America's history to get there.
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