Time and again it’s the same. A lone gunman or a small group of killers with rifles commits spectacular crimes that seize the attention of the world.

The list reaches back decades: the killing of Israeli athletes at the Munich Olympics in 1972; the school takeover in Beslan, Russia, in 2004; the attacks in Mumbai, India, in 2008; the mall assault in Nairobi, Kenya, in 2013; the killing of more than 100 people in Paris in 2015.

Often the rifles are variants of the AK-47, the world’s most abundant firearm, an affordable and simple-to-use assault rifle of Soviet lineage that allows a few people to kill scores and menace hundreds, and fight head-to-head against modern soldiers and police forces.

In recent years they have also been descendants of the AR-15, the American military’s response to the Kalashnikov’s spread. Semiautomatic versions of the AR-15 were used by sympathizers of the Islamic State in San Bernardino, Calif., in 2015, and a Mini-14 and an MCX, rifles that fire the same cartridge as the AR-15 and compete with it for market share, were used in the mass shootings in Norway in 2011 and in Orlando, Fla., in June.

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