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In this undated photo, chunks of chemically processed rare earths are shown in Beijing. China's recent halt of exotic metal shipments to Japan amid a diplomatic spat has reverberated throughout the world's high-tech manufacturing hubs _ now on heightened alert to the risks of relying on one country for materials that do everything from helping hybrid engines run to creating the color red in televisions. (AP Photo/Kyodo News)

In this undated photo, chunks of chemically processed rare earths are shown in Beijing. China's recent halt of exotic metal shipments to Japan amid a diplomatic spat has reverberated throughout the world's high-tech manufacturing hubs _ now on heightened alert to the risks of relying on one country for materials that do everything from helping hybrid engines run to creating the color red in televisions. (AP Photo/Kyodo News)

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Best combat rifles of all time

A combat rifle is a military service rifle that fires a full-power rifle cartridge, a mainstay of every modern army in the world. See the best combat rifles ever made.