Fixed it for you. Many more have taken their place, but it is probably only time until they are raided, too.
BTW, having "build parties" is what tripped up a few of them. And, having a CNC machine programmed to machine it, leaving you only having to push the "on" button was another one.
A previous injection moulded plastic lower manufacturer offered one that was complete except for enlarging the undersized existing holes in the sides. Since it took VERY little time to injection mould a lower, just enlarging the holes was truly 20% of the work time. They are no longer in business. My guess is that the latest one was just too easy to complete.
Thanks. I was relieved to see that Brownells still had 80% lowers on their web site. I seem to recall an article describing a Chinese concern which was calculating their upcoming shipments by the ton. There must be a lot of interest.
Gun owners are so accident-prone these days that it seems like a lot of work just to see one's carefully crafted receiver sink to the bottom of a lake. Future generations may be mystified by the hazards to navigation created by such hobbyists.