There are already hybrid printed/ metal slide "kits" in development that are made from laser cut sheet steel and welded together by the end user. The printed community is pretty versatile. They have alternatives for home rifling as well as reloading without conventional supplies, printed FCG's, auto sears, supressors, and a cornucopia destructive devices. For people in Free America going all the way to non-gun parts makes little sense, but it may someday.The only limit is the number of Glock slides and barrels the after market can produce, and the number of aluminum AR 80% lowers produced, or printed by 3d printer.
AMERICAN INGENUITY.