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Co-founder and CEO of Whatsapp Jan Koum speaks during a conference at the Mobile World Congress, the world's largest mobile phone trade show in Barcelona, Spain, Monday, Feb. 24, 2014. Expected highlights include major product launches from Samsung and other phone makers, along with a keynote address by Facebook founder and chief executive Mark Zuckerberg. (AP Photo/Manu Fernandez)

Co-founder and CEO of Whatsapp Jan Koum speaks during a conference at the Mobile World Congress, the world's largest mobile phone trade show in Barcelona, Spain, Monday, Feb. 24, 2014. Expected highlights include major product launches from Samsung and other phone makers, along with a keynote address by Facebook founder and chief executive Mark Zuckerberg. (AP Photo/Manu Fernandez)

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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.