“Machine guns are back, and they’re everywhere.”

This episode contains graphic descriptions of gun violence.

According to a new analysis provided exclusively to CNN, the number of shootings involving automatic weapons in the US has sharply risen over the past few years. We examine how a small piece of plastic can transform a semi-automatic weapon into a machine gun in a matter of moments and how law enforcement is responding.

Guest: Curt Devine, CNN Investigates Producer

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