Uh, not really... Other than both the Leopard 2 and the Abrams both have their roots in the MBT-70 project, and use some form of Chobham armor, there is no relation between the four designs. The M1A1 adopted the German gun, but the other guns are different. The British is even rifled.Originally posted by Lynx-Eyed
Actually most of the modern battle tanks (Leclerc, Challenger, M1A2) are modifications of the german Leopard, it was the first tank with a BK 120 mm canon which is used by the most of these.