Info on pistol grips and their use(gun control clification,legalities)?

I've heard from a lot of gun control advocates that a pistol grip on a ualt rifle was designed for "spray fire from the hip" been searching the internet for reference on this but have found nothing.For staters you could only do spray fire if it was a cl III weapon,you cant aim at the hip,all the recoil goes into your wrist,it is a lot more awkward to hold in that position(it would be easier without a pistol grip) and mag changes are almost impossible if the position of the rifle is not changed.Also if anyone had done this on a range when I was in the military they would have been kicked off as a safety violator(KD or CMP).Did find a 1945 U.S. army report on the sturmgewehr 44 outlineing the characteristics of an ualt rifle ,but it made no metion of this as one.Main question is what if any reports clified a pistol grip in this manner and was this clification used as justification in the California and sunseted assualt weapons ban?