A breakdown of gun terminology to help you in discussions on mass shootings and debates over gun control

Tech Insider : Politics
AR 15
AR-15 rifles for sale at the Guntoberfest gun show in Oaks, Pennsylvania.

Joshua Roberts/Reuters

Here's how the polarizing M16 or AR-15 rifle went from a symbol of America's lost war in Vietnam to being owned by about 16 million Americans in 70 years

Tech Insider : Politics
Reporter Betsy Halstead stands on the bed of a truck holding an M16 automatic rifle
Reporter Betsy Halstead learns how to fire an M16 automatic rifle during the Vietnam War in 1965.

Bettmann/Getty Images

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