The Lewis gun, also called Lewis automatic machine gun or Lewis automatic rifle, is a World War I–era light machine gun of American design that was perfected and widely used by the British Empire. It was first used in combat in World War I and continued in service with a number of armed forces through to the end of the Korean War.

It is visually distinctive because of a wide tubular cooling shroud around the barrel and a top-mounted drum-pan magazine. It was commonly used as an aircraft machine gun, almost always with the cooling shroud removed, during both World Wars.


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