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The third model, the M1A1, or M1 with Block 1 Product Improvement, started in August 1985. In addition to the improvements fitted to the IPM1 tank, the M1A1's major asset was to be the German Rheinmetall 120mm smoothbore cannon. US studies on the gun concluded it was overly complex and expensive by American engineering standards, so a version using fewer parts was developed, and designated the 120mm M256 gun. Along with the new gun came a number of associated changes to the fire control system.
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"Always with the negative waves Moriarty, always with the negative waves." TSGT Oddball, Tank Commander
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