While in the Marine Corps I had the chance to fire a Columbian mg-42 it was of WW2 mfg. I think Poland? They had piles of them. I burned 600 rounds and walked away very impressed. For a medium machine gun it ran belts VERY quickly. But not only did it have a high rate of fire, it also vented well and it had 40-50% less heat than the m-60E-3 I carried. The barrels swapped out easily and it was easy to control your rate of fire and accurate.
I found myself pretty jealous.
The m-60 trigger group used to fall off in the middle of shooting it /humping it around. Then you have to slam fire it to get it up and running. not a lot of fun.
I dream of a time machine. I would cruse through time grabbing mint condition weapons and fast cars. Maybe someday right?