My understanding has been that the M60 was based on the FG 42.
The amount of ballistic and mechanical cross-pollination that begat the modern "assault rifle" is sort of fascinating to read about. The intermediate caliber idea went back a lot further than most people would think, and another Russian (Federov) may have been the more original thinker compared to Kalashnikov.
Mr. niteowl77
Yup and just a few years earlier the French Army came up with the bright idea to field a new bolt action rifle...
https://en.wikipedia.org/wiki/M60_machine_gun
“The M60 machine gun began development in the late 1940s as a program for a new, lighter 7.62 mm machine gun. It was partly derived from German guns of World War II (most notably the FG 42 and the MG 42),[5][6] but it contained American innovations as well.”