M1A1

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A U.S. M1A1 tank—essentially an M1 Abrams main battle tank with a 120-mm gun adapted from the West German Leopard 2 M1A1 and powered by a gas turbine engine.

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M1A1

United States tank

Learn about this topic in these articles:

tank development

In tank: Gun calibre
…the 1970s, but the subsequent M1A1 version of the 1980s was rearmed with a 120-mm gun originally developed in West Germany for the Leopard 2 tank. The British Challenger, introduced in the 1980s, was also armed with 120-mm guns, but these were still of the rifle type.
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