Heavy automatic machine gun that the US military used. It initially had numerous problems with overheating barrels. The gun had to be almost entirely disassembled to switch out barrels. The gun was then refined to include an integrated bipod and heavier barrel that resisted overheating. M60 has since been replaced with the smaller .223 fully automatic SAW (Squad Automatic Rifle)which can be both magazine or belt-fed.

A medium machine gun, used by the US military. It is gas-operated, air-cooled, and belt-fed, using a roller-locked bolt. It fires the NATO 7.62x51mm ammunition (the military version of the .308 Winchester rifle cartridge) at a rate of approximately 550 rounds per minute. In practice, however, a gunner would never fire such a long burst.
The M60 (also seen as M-60) was intended to be a General Purpose Machine Gun (GPMG) that could perform all combat roles well enough. However, it proved to be heavy and unreliable in service, and was soon known as "The Pig" by American troops.
One of its primary disadvantages as a machinegun with a lightweight barrel, for field use rather than emplacement use, is that the barrel could not easily be changed for a fresh one, as the bipod and gas system were permanently attached to the barrel. This greatly limited the weapon's practical rate of fire, as the barrel should be replaced after roughly every 200 rounds when in rapid-fire engagements. Without being able to change barrels, gunners had to restrict their bursts of fully automatic fire to short, spaced ones rather than the longer bursts that machine guns are tactically intended for.
Further, its firing pin and other small parts of the firing system were notoriously weak and prone to breakage and failure.
The M60 was later revised to the M60E3 standard, lightening the barrel further, along with other components, and moving the bipod to the gas cylinder housing in order to allow quicker...

A large 7.62 mm 200 round heavy machine gun, that kicked ass in nam' but is now discontinued by the U.S. military who seems to not like big bullets anymore.

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