The deadliest mass shootings in recent history have had one thing in common: the perpetrator used an assault rifle. Why it matters: These weapons possess an incredible amount of killing power, and amplify the destructive will of the person who carries out an attack. Nine people died and 27 were injured in a mass shooting in Dayton, Ohio in an attack that lasted 32 seconds. The killer used an AR-15 style assault rifle. Since 1999, there have been 115 mass shootings (defined below) in which 941 people were killed and 1,431 were injured. Of those 115 attacks, 32 — just over a quarter —...…The deadliest mass shootings in recent history have had one thing in common: the perpetrator used an assault rifle. Why it matters: These weapons possess an incredible amount of killing power, and amplify the destructive will of the person who carries out an attack. Nine people died and 27 were injured in a mass shooting in Dayton, Ohio in an attack that lasted 32 seconds. The killer used an AR-15 style assault rifle. Since 1999, there have been 115 mass shootings (defined below) in which 941 people were killed and 1,431 were injured. Of those 115 attacks, 32 — just over a quarter —...WW…