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Former Sen. Rick Santorum of Pennsylvania, a Republican presidential candidate, leaves PGT Industries in North Venice, Fla., on Monday. He is in Florida stumping ahead of next week's primary in which 50 delegates are on the line. The candidates are trading bitter blows on the campaign trail. (Associated Press)

Former Sen. Rick Santorum of Pennsylvania, a Republican presidential candidate, leaves PGT Industries in North Venice, Fla., on Monday. He is in Florida stumping ahead of next week's primary in which 50 delegates are on the line. The candidates are trading bitter blows on the campaign trail. (Associated Press)

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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.