Actually the M240B is used with TAC-P, Green Berets, Rangers, and other small to medium sized units SF untis for suppresion and cover fire. The M240B replaced the older M-60 around 2005.
Believe me it is heavy especially if you do not have an AG (assistant gunner) to assist with carrying the ammo. I know from expierence.
If you utilize the weapon correctly it can be a powerful tool
I know what it's used for, I'm just saying a MK48 Mod 0 would be a much wiser choice for a 4 man squad like the Ghosts. I'm sure you are familiar with both, to some degree, but I'll run some numbers anyway
Weight (Empty):
MK48 = 8.2Kg
M240B = 12.5Kg
Length:
MK48 = 1,000mm
M240 = 1,245 mm
It's clear the lighter Mk 48 would be preferred by a small unit. It's easier to handle by one man, and it's lighter = operator can carry more ammo
FN Herstal was tasked to develop the Mk 48 directly by US SOCOM, which I would assume the Ghost are commanded by
either way, I'm happy we're getting a new LMG