>>64499221
gun stabilizers werent as good in the 60s as they are today, they just allow for quicker shots on a short stop rather than full shoot-and-move capability and the M60 was a fairly stable gun platform to begin with
the US was working on a 2-plane gun stabilizer on the T95, but it was cancelled, and only the version without a stabilizer could be mass-produced in a hurry as the M60A1
the M60A1 was meant to be a temporary measure, they didnt want to install 5000 stabilizers on all of them only to have to remove all of them later
but then the MBT-70 program got delayed, and eventually cancelled, so it became clear that their temporary measure was more permanent than they thought
so they just ended up slapping a 2-plane stabilizer on the M60A1 in 1972, by which point stabilizers on most tanks were mechanically effective enough to allow for accurate shooting at several hundred meters range