Stoner Weapon System replacement?

[history1861]

I have experimented in several different campaigns with switching out the Basic Load weapons but always seem to come back to the ones in 3rd Edition. It feels more like Morrow Project that way...
That said, I usually add the M16A2 as a replacement system and upgrade the M16A1s (Basic Load 2), though I've kept the XM174 grenade launcher, instead of replacing it with the Mark 19. The differences in size and weight between them convinced me of that. I know the system didn't work out well in the Real World, so let's hope the Project managed to fix the problems it had.
I always liked the idea that there were redundant systems in the Project, like the Uzi/Mac-10, indicating that MP was picking things up as they went along and that it wasn't a monolithic entity you were dealing with but rather a group trying to get things done as best they could.
Though, I've been playing and running the game since the 80s so perhaps I'm just set in my ways.
Also not a fan of the Humvee so I normally keep the XR-311 too..