I really hope that a new gun is adopted by the Army. While I do love the M4 platform for it's uses and customization. The fact of the matter is this. The M16/M4 is a 60 to 30 year old platform that has limitations on it. I know alot of people would love to keep and and use the M16 and M4 well into the 2030s or 2040s. However let's be honest and real here. With the next Generation body armor getting better and better at stopping 556 rounds. The Military will need a round that is capable of defeating the armor. And the 556 round just doesn't have the ability to defeat these new armors. If the 6.8mm has the ability to reach out like the 556 but has the knockout ability of the 308 I say why not. Let's give this new round a chance to prove itself. This is nothing new if we look back 70 to 90 years ago I betcha them old ww2 veterans probably bashed the hell out of the 556 rounds as well as the M16 when they first came out. As I have a feeling the same will be done with this new 6.8mm round when it's adopted into the Army.