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Novak Djokovic of Serbia celebrates his win against Juan Martin Del Potro of Argentina at the end of their ATP World Tour Finals single tennis match at the O2 Arena in London Thursday, Nov. 7, 2013. (AP Photo/Sang Tan)
Photo by: Sang Tan
Novak Djokovic of Serbia celebrates his win against Juan Martin Del Potro of Argentina at the end of their ATP World Tour Finals single tennis match at the O2 Arena in London Thursday, Nov. 7, 2013. (AP Photo/Sang Tan)

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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.