The AR-15 and America's love of military-style weapons

Time and again, America's worst mass shootings have featured a common thread: the killer's use of a military-style assault rifle that is inexpensive, easy to use and deadly efficient. The type of weapon, commonly known as the AR-15, is once again under scrutiny with critics calling for a ban after last week's massacre at a Florida high school that left 17 people dead. The AR-15 is a semi-automatic weapon, meaning a user can fire off multiple shots in quick succession.

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