The Army Needs To Replace the M4 Carbine. What Would Make the Ultimate Rifle?

It would be interesting to see what comes out, as well as what round, I hope politics won't play a big roll in what is chosen.

Anything that has a larger caliber, and better knock down power.

Something akin to the HK417. It’s the M4 platform that everyone is used to but it’s 7.62x51 and it’s piston as opposed to impingement.