The first step would be to move up to a caliber that ends a fight with one hit.I gave up on 5.56 as a serious caliber years ago,give me a 7.62x51.
IIRC, the deal with the 5.56 was to wound the enemy and cause a couple other soldiers to haul him out of the fight, thus reducing the fighting capabilities of the enemy, plus pound for pound, you couple pack 3X the ammo in the field carrying 5.56 v. .308 or 30-06. Both have their advantages/disadvantages.
I waited nearly a decade for the 6.8SPC to catch on, but the necessity for cartridge-unique magazines went against it. Then the .300 Blackout came along, and for suppressed weapons, it does indeed answer some real need- and it works with the standard GI mag, or replacements thereof.
Now I think I've found the one that works for me. I've got about 8000 rounds through my .300 Blackout barrel [well, 1500 rounds about 5 times each] and so I have a new chambering reamer on the way: 7.62x40 WT
Yep, standard GI magazines. Or MagPuls, or what have you.
We shall see....