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In this Aug. 27, 2010, photo, research technician Danielle Fontaine holds a test tube glowing with bioluminescent protein derived from fireflies at a laboratory at Connecticut College in New London, Conn. (AP Photo/Jessica Hill)
Photo by: Jessica Hill
In this Aug. 27, 2010, photo, research technician Danielle Fontaine holds a test tube glowing with bioluminescent protein derived from fireflies at a laboratory at Connecticut College in New London, Conn. (AP Photo/Jessica Hill)

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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.