R. Lee Ermey tours the Knob Creek Machine Gun Shoot in West Point, Kentucky.

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R. Lee Ermey is rocking and rolling after dark in this installment of "Mail Call" as he comes to us from the Knob Creek Late Night Machine Gun Shoot in West Point, Kentucky.

In a Mail Call video, R. Lee Ermey answers a question from Tom of Kansas, who wants to know what the biggest gun in the world is. Ermey says to answer this question you first have to define what you mean by big; for we all know that guns like Big Bertha and Anzio Annie are big, but if you are talking total weight and size of the shell, then they are not the biggest. The Gustav gun created by the Germans, takes the cake on this one with an 80cm barrel. The Germans first used this gun in World War II; it was designed to pulverize French defensive bunkers in the early days of the war.

Discover how the Browning 50-caliber machine gun changed the face of U.S. combat, from its inception during World War II to its continued role in obliterating large targets.