08-22-2011, 06:24 AM
I really don't see the US Army approving anything in other than 5.56mm, given the huge amount of effort and publicity behind the M855A1 and the fact that their own in-house study of carbine calibres (which came down in favour of the 6.5-7mm range) has been withdrawn from further discussion after the initial presentation. Those in charge are not interested in rocking the boat.
