The m4 was never meant to be system wide. Only for armor units and things of the nature, confined spaces. and of corse sf.
The m4 is way to expensive to be system wide to be cost effective. the hk will be brought in because of cost because it is cheaper and you can go from carbine to sniper modle at 10 level maintance.
it wont Switching will cost $1000 per rifle, due to training costs, shipping and storage changes, etc. X 2 million rifles=$2 BILLION, and it wont change jack squat, because the rifle means so little on the modern battlefield, and because the M16 does just fine.
When the military changes over to a new, bigger, BETTER cartridge as the "standard" instead of the .223, will you leave the forums and never come back? I'd rather THAT bet that your silly offer of a money bet.