According to Aries the bolded part is NOT true. According to Aries they mold the area of the fire control group in on color of plastic, then they mold the remainder of the lower AROUND that section of plastic. So they end up with a dual color lower but they DO NOT make the legal lower first, THEN fill it in with AFTER the lower is made.
Good to know. I was just going off of the first video, they only made brief mention of it, and without digging around more, what I posted was my take away. I suppose it kind of falls into the pistol/rifle AR, or the shotgun/AOW category of firearms. Where its dependent on which was it was configured first, or how it was molded. Sucks that it has to be so convoluted.