The M68 is an American 105 mm tank gun. It uses British-designed L7 gun tube and cartridges with an
American-designed mount, breech assembly and recoil mechanism.
Front view of a M68E1 gun on an American M60A3 main battle tank during a military exercise in Nuremberg, 1986.
The M256 is an American 120 mm smoothbore tank gun. It is a licensed-built German-designed Rh-120 L44 gun tube and combustible cartridges with an American-designed mount, cradle and recoil mechanism. It is primarily used by the M1 Abrams main battle tank.
Front view of a M256 gun on an American M1A2 SEP main battle tank during a gunnery exercise at Red Cloud Range, 2013.