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Participants warm up in a circle as a group before a Parkour training class in Brookline, Mass., Wednesday, Jan. 29, 2014. (AP Photo/Charles Krupa)

Participants warm up in a circle as a group before a Parkour training class in Brookline, Mass., Wednesday, Jan. 29, 2014. (AP Photo/Charles Krupa)

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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.