I loved the M60 !
I have related the story before as to how we welded up the front and rear parts of the receiver that caused runaways or failure to fire etc !! We had some custom op rods with dual sear notches etc ....all the wear points were case hardened and ceramic coated like the sear and such .......
Beau Coup Pucker Factor Belts were nooooooooo problem !
Great memories !
Stay safe RR !
Circa 1979-80 when I was a Navy civilian armorer we rebuilt some M60 MGs for one of the Navy's SEAL teams prior to one of their working beachfront vacations in a then-busy Central American country. My contribution was the application of a vinyl phenolic/teflon coating to the op rods, sears, bolt innards and the recoil spring's *knitting needle* guide, which both increased the saltwater corrosion resistance of the parts and increased the guns' [four for 15 guys] cyclic rate a tad. The material used was the same stuff we were at that time using on turbine engine blades to try to get a little longer life out of them.
It apparantly worked- when they got back, a couple of them armtwisted me into similarly working over some of their personal handguns. Though they weren't as fond of the M60s as they had been their previously-used Mk23 Stoners, the extra power and range of the 7.62 was appreciated by them, and the high-speed coatings kept their whining to a minimum.
There must have been some kind of termite problem down that way- those guns came back with barrels a LOT shorter than when they'd left.