I saw this over on the forum where some discussion was going on about these chopped down and redone M60s. Clearly used in Vietnam you can see how they were shortened to make them handier for use in the field and on helicopters.
The one above was modified to fit inside the “loach” scout helicopter for the pilot to use on targets of opportunity. Makes me wonder about how much of a problem the links and brass may have caused inside though.
The bottom is a regular infantrymen with a shortened M60.
I’d want a lighter M60 too if I was going to be carrying that much belted ammo on my body.