Business Insiderflipped into Latest StoriesParkland, Florida, and the deadliest shootings in US history all have one thing in commonverified_publisherBusiness Insider - Alex Lockie• The police say Wednesday's mass shooting, which killed 17 and injured 14 at a Florida high school, involved an AR-15 semiautomatic rifle.• The same type of gun has been used in the deadliest shootings in modern US history.• The suspect in Florida, who legally bought the AR-15 authorities say was used …
