The 42, the answer to the question of how fast is too fast.
I never heard a Machine gunner complain about putting too much lead on target.
Didn't Jesse Ventura have one of these strapped to his chest?
I had buds who were in Vietnam discuss M60 races. Grunts would polish parts, play with the gas system, to get the cyclic rate up, and then bet, whose M60 was faster.
One bud of mine got to shoot the German MG3, the 308 version of the MG42. Rheinmetall MG 3 https://en.wikipedia.org/wiki/Rheinmetall_MG_3 Bud preferred it to a M60, one reason, he claimed he had to get up in front of a M60, buttocks toward the enemy, to change barrels. The MG3, pull a lever, tilt the gun, and the barrel falls out. I have read comments from a Military Advisor in South America, a continuing problem with the M60's was that the firing pin assembly could be assembled out of order. This is very bad. No weapon should ever allow its operator to assemble parts backwards, sideways, out of sequence, into a complete weapon. One reason the Ross rifle is still remembered is because it was possible to assemble a Ross rifle and not have the lugs in battery when a round fired.