The M-60 is a wonderful and fascinating beast.
From the operator standpoint it has several salient, positive features.
First, it is ergonomically comfortable. The wide, rubberized forearm with heat shield keeps the hand from being burned even when the barrel is glowing red. The sling swivels are correctly positioned on the top rear of the butt stock and on the right side of the forearm, angled for "assault" carry. These aspects certainly aid in reducing the gunners fatigue.
The rate of fire is a nominal 550 rpm, which is just about right if you are humping the ammo. A skilled gunner should have no trouble firing single shots or bursts of 2 or more rounds. The barrel, with it's stellite lined chamber, is fairly substantial without being too much of a burden. Mounted upon the M-122 tripod the weapon has demonstrated accuracy to 1,000 meters and beyond, while maintaining a fair standard of accuracy from it's bipod, mounted near the muzzle.
TimJ, M-60 Gunner 1987-