the whole point of the 6.8mm was that it would work in a 5.56mm lower. the switch would involve changing the barrel and bolt.
i’m still puzzled why they didn’t adopt it, particularly so because they’ve made the m4 carbine standard issue. they understand that they need to fight house to house, but they won’t use a larger bullet to do it. i suspect that the 3,000 fps mafia won’t let go.
I would have preferred the 6.5 Grendal to the 6.8
Both in in the same platform.
The ballistics of the 6.5 Grendal looked better
for both short and very long range.
It seemed the 6.5 Grendal had better
terminal velocity at 1000 meters than the .308