If your boss' brother had the ability to do that, he could have easily unscrewed the barrel and handed that in, then rebarreled with something 105+. His approach seems a silly, wasteful, and expensive way to make a point.
I've spent money on my AR, and rather than convert that investment into scrap via the Blue Flame of Anger, I'd just as soon hand them a stripped lower receiver and tuck everything else into a bolt-action chassis.
But maybe I'm weird.