Yeah, he still doesn't seem to be able to grasp the concept of muzzle rise and how it affects firing on full auto. The almost completely uncontrollable nature of firing full auto was the reason for the switch from full auto to burst fire on service rifles.
What about submachine guns or PDWs with muzzle breaks and/or foregrips?
Something like this: http://en.wikipedia.org/wiki/KRISS_Vector
Designed to reduce muzzle rise.