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In this photo taken from NASA television, Expedition 24 astronauts work outside the space station, Monday, Aug. 16, 2010. (AP Photo/NASA)

In this photo taken from NASA television, Expedition 24 astronauts work outside the space station, Monday, Aug. 16, 2010. (AP Photo/NASA)

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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.