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Rory McIlroy, of Northern Ireland, signs autographs after a practice round for the PGA Championship golf tournament at Valhalla Golf Club on Tuesday, Aug. 5, 2014, in Louisville, Ky. The tournament is set to begin on Thursday. (AP Photo/David J. Phillip)

Rory McIlroy, of Northern Ireland, signs autographs after a practice round for the PGA Championship golf tournament at Valhalla Golf Club on Tuesday, Aug. 5, 2014, in Louisville, Ky. The tournament is set to begin on Thursday. (AP Photo/David J. Phillip)

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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.