Bumping this thread, as @Franklin Armory poked the bear, me.
I whole heartedly agree with @e92m3allday on this. As per Federal Law, one may acquire a stripped AR receiver, install the lower parts, add an arm brace, slap on a front vertical grip to a 10.5" upper, then hook the upper and lower together. Woola!! You've built a 26" firearm.
It is not a pistol, as it is designed to be fired with two hands. It is not a rifle, because it does not have a stock which is designed to be fired from the shoulder. It is not an AOW, as it is over 26" and not concealable.
In fact, it does not need to comply with the NJ AW Ban because that pertains only to rifles, pistols and shotguns.
Okay, so who can word a letter properly to the NJSP or NJAG to address this legal issue, ie the shockwave approval letter. @JasonSeidman