Actually they can. You wouldn't want to see the price after all of that machining required to get a receiver to a finished product from bar stock. The beauty of MIM is the part comes out pretty close to the required dimensions and very little machining is necessary. Huge cost savings in labor. The war started at the end of a depression and 15% of the workforce was unemployed. Those people went to work for defense contractors. The gov't provided the machinery to the contractors to build those rifles. Basically, the gov't built those rifles and inspected every one of them. The taxpayer footed the bill. Like FoMoCo, quality was job one.