Is that right?
"The main armament of the M1A1 and M1A2 is the M256A1 120 mm smoothbore gun, designed by Rheinmetall AG of Germany, manufactured under license in the United States by Watervliet Arsenal, New York. The M256A1 is a variant of the Rheinmetall 120 mm L/44 gun carried on the German Leopard 2 on all variants up to the Leopard 2A5. Leopard 2A6 replaced the L/44 barrel with a longer L/55." - Wikipedia
1. I was not aware that the US had maintained the capability to manufacture these guns under contract.
2. Apparently our tanks do not have the upgraded version of this gun which is used in the German Leopard tank.