Stamped sheet receivers and welding were cheaper, relatively, for mass production in the 60's and 70's. It is hardly efficient and flexible in production to get a big expensive setup to make one product only. While the Us manufacturers have taken advantage of fast and cheap cnc machining, the Europeans need to go to plastic as their costs are higher.
That's why back in those days, the Armalite, with it's exotic aluminium alloys, aerospace forgings, lightweight construction, unique gas system was such a marvel. Still is come to think of it, but we're just spoiled. All the welded sheet steel guns seem like heavy clunkers in comparison.



















































