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.
Same ceramic coating I believe we used. I have a snub Mod 37 airweight that was done with it as well........Used it as an ankle rig backup when I was a deputy and on road trips. No oil or lube meant no dust bunnies or dirt . Good stuff !
http://video.aol.com/video-detail/m-60-machinegun-glowing-red-1500-round-burst/50084456
I do believe the title is short a few thousand rounds.....:o)
15k maybe ....not 1500 !