That Mk43 is an M60E3 with a shorty barrel and an open vortex flash hider (salad fork), a steel feed tray cover with a MILSTD 1913 rail, and what looks like a new can hanger. However, they report that they went back to the M60E3 gas port and birdcage flash hider, so now it's more M60E3 than Mk43.
That thing almost certainly began life as an Echo 3. That must have been a PIP 'upgrade'. After reviewing what you linked to, I stand firmly behind what I wrote originally. ;]
It is undoubtably still a huge piece of poop: The trigger group flex plate fastener is still easily knocked off eitherdropping the entire trigger housing group into the bush on night patrol or causing a 'runaway gun' in a firing position, heats barrels to cigarette cherry red after 100 rounds rapid fire, slamming the feed tray cover down when the bolt is already forward bends or breaks the delicate roll pins and springs which will seize up the cam path action permanently, the plastic buffer housing group is probably still crack-prone, and I'm sure that the Mk43 is still the sideways-ejecting link-jamming POS the M60 series always has been.
I am familiar with the M60. They are doody.
The M240 is a real GPMG designed around the famous Browning action that served us impeccably in WWI and WWII.