Agree whole heartedly. Fired several AK's on full auto while in Iraq and Afghanistan. They climb and I mean fast. M4 on 3 rd burst was much more controllable. Not a huge fan of full auto and did not care fire 3 rd burst. But I grew up with single shots and side by sides. After several other of uncles schools I learned to fire as few rounds as possible and go to ground. A 6.5 grendel would work well on 3rd burst. Anything bigger you have control problems and it's just pray and spray. My school of thought is staying with small calibers will facilitate more spraying of ammo everywhere. A larger round will be well suited to disciplined shooters. Two schools of thought. Scared youngsters will go through mag after mag. Experienced combat troops pick their shots. Guess what we have more of. It's a difficult call that many of the folks in DoD acquisitions have to juggle. What fits in the most situations? Not a call that can be made lightly. Should be interesting to see what the services choose. So many moving parts (NATO,UN, allies, inter-service capatibility etc) not a simple switch scenario.