Also let me add a bit more.
I am convinced the design attempt (and its an attempt) to have small arms weapons system that can penetrate near peer body armor is misguided.
Why?
Most hits in combat are against extremities anyway even when controlling for Level IV armor because it will only cover a small portion of the body.
Its a lot of effort for a dubious capability that will result in heavier ammo and heavier barrels (IF they achieve it) and modern ceramic level IV armor can stand up to 30-06 AP... Are they seriously suggesting they will produce a practical assault rifle with practical (reliable, affordable and lightweight) ammo that can do this?
Instead think of something approaching a "50 cal Assault" rifle
It's not realistic and there simply is not huge advance in powder science that has happened (or can be predicted) that would allow this advertised performance w/o prohibitive penalties.
My prediction:
It will come for naught and will be quietly dropped just like all other initiatives to "dramatically" improve on the M16/M14 gun/ammo system.
Lets face it for the time being small arms development has plateaued and it will take a breakthrough in chemistry (powders) and metallurgy (barrels to handle the much larger pressures) together to jump to the next level.
neither of which are on the horixon right now.
So dont worry.
A quality AR15 will still be a competitive small arms system for your son or perhaps even grandson to bear.