The semi-automatic rifle has been in wide circulation for more than a half-century. In recent years, gunmen have used AR-15-style weapons to carry out many of the country's worst mass shootings.

After a yearslong and complex legal struggle to reclaim their weapons after they were seized by authorities more than five years ago, police have returned the AR-15 to St. Louis lawyers Mark and ...

The AR-15 semi-automatic rifle is one of the most popular guns in the U.S., and one of the most reviled. It is an emblem of America’s political divisions, beloved by firearm enthusiasts for its ...

The calculation that a .223 round fired from an AR-15 can reach speeds of up to six football fields in a second was made using a 55 grain .223 Remington full metal case round fired at a horizontal ...

The AR-15 has become inextricably linked with mass shootings in the U.S. A 2020 study by professors at the University of Alabama and Worcester State University found that semi-automatic rifles are ...