First of all... where's the new rifle?
Secondly. I like M60s in general but the 2 halves of the reciever will
eventually loosen up. There are only 4 rivets holding it together. All in all the M240 is better than the M60 but I would still rather have an M60 unless I wanted to put a million rounds through one. The M240 probably isn't balanced as well for assault firing
ala Rambo and it's about 9 pounds heavier than the lightweight version of the M60. But it's also built from solid slabs of steel instead of sheet metal. It's a trade off but the M240 is better in some ways, like duarability. I like both of them for different reasons.
I've replaced so many M60 parts that someone else neglected, that I still know the National Stock Numbers for 3 parts right off the top of my head
25 years later. As soon as I forget them I can remember my mom's anniversary and phone number.

The only M240s we had back then were co-ax machineguns on tanks. They had sawed off pistol grips and were solenoid fired. They pointed wherever the main gun on the tanks did. I hardly ever had to work on them, but some of that had to do with the small numbers of them compared to M60s/M60Ds, and the fact that they weren't leftovers from Vietnam still being used in the 80s.
One time they brought an M240 into the shop that some DAT (dumb a$$ tanker) had taken the buffer apart and stacked up all the cup washers facing one way instead of altermnate directions. The operating rod went back so far it damaged the buffer housing. A little work with a file and putting all the parts together right and I had it fixed. That problem isn't possible with the M60 but others are. One time they brought in a "runaway gun". Some Grunt took the sear out and put it in upside down and backward. When they cocked it, the gun shot until it was out of ammo, without the trigger even being pulled. I assume someone broke the belt off before it fired the whole 9 yards. Neither design is foolproof and they certainly aren't d*mned foolproof because some d*mned fool can screw them up. Sorry about the long post but thought you guys might want to learn more about these two guns.