I really liked the M60, especially with a proper infeed ramp installed to aid the unit installed at the factory.
It was intended to have second crew member linking and helping to feed the belts or to be fed from an ammo box, but the gun was so handy, there was often only a single operator and holding up the gun, with one hand, while trying to control the belt feed, resulted in uncontrollable jamming. Usually at a time when such things are the least needed.
I've seen everthing from Beer Cans to well made ramps attached to them to alleviate this problem.
Reasonable rate of fire, which on some models, could be slowed right down to keep them on target and slow down the temp rises of the barrel.
Really great balance as well. Most of the weight is between your hands in the pictured position.
I don't see a belt hanging down, or any heat shimmer coming off the barrel, so I would assume that's a "posed in action" shot.