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Scott O'Shea rigs a tower in preparation for Nik Wallenda's tightrope walk in Niagara Falls, N.Y., this week. Mr. Wallenda estimates his U.S.-to-Canada walk by way of a cable strung over the brink will cost $1.2 million to $1.3 million. (Associated Press)

Scott O'Shea rigs a tower in preparation for Nik Wallenda's tightrope walk in Niagara Falls, N.Y., this week. Mr. Wallenda estimates his U.S.-to-Canada walk by way of a cable strung over the brink will cost $1.2 million to $1.3 million. (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.