Its a great squad rifle
Its a little lighter than the M60 and more reliable.
Under full auto, its much easier to get a first burst hit and keep the cone on the target. Very smooth.
The tracers are something to behold. One of Murphy's laws of combat is tracers work in both directions. With the M856, the trace isn't noticable until past 200 yards, perfect for SAW work.
The real kudos goes to the belt feed. Much better than the M60 AND the belt isn't swinging and catching dirt. The M60 had a problem with that and any interference on the belt killed the fire.
Some think its too weak but I don't know as I've never had to use one in combat. It certainly will make exposed troops duck for cover! I doubt an M60 will be much good against any real armor, say any APC. Besides, I'd hope my 203's will be lobbing HEDP's on the APC to shuck the grunts from inside. Once they disembark, the SAW and 16's will light them up.
Then I call in the TOW crew to kill the APC. Or call in the helios for a Copperhead.