Our military adopting the Grendel?

[stanc]

The Grendel is more effective at all ranges. Yes training, logistics, barrel life mag capacity, etc. are important but for the argument of this subject the Grendel is a better trade off in almost every account. The 5.56 will kill you dead with good shot placement , but for long range, short range, barrier penetration, terminal effects in a AR- type platform the Grendel rules.

Probably true, but it hasn't yet been shown via testing

The 5.56 is slightly lighter and a little better mag capacity.

Actually, 5.56 is significantly (29%) lighter and has significantly (20%) greater magazine capacity.