Quality Hardware and Machine Company was located in Chicago. Before the war they made tools, dies. machinery, stampings and some other things dealing with equipment. Quality only made the carbines receiver and had as many as 100 sub-contractors making everything else. They received their barrels from the government free issue program. Quality was the company that started with testing cast parts for carbines. SA was very interested in this and in testing found the cast parts to be in general OK BUT they also found that the parts did not hold up well in cold weather. But Quality Hardware was a company that was always looking forward with carbine production and made many of the jigs, and tools needed for carbine production by other companies.
Quality Hardware was also involved in making special equipment for the fabricating and handling of uranium components for the University of Chicago during the 1944-1945 time frame. Rumor has it that this was in support of the Manhattan project. The company liquidated it's assets shortly after the war and no longer exists. The original Quality Hardware facility was at one time considered a candidate for the governments radiation cleanup program. I guess it was decided that radiation levels were below cleanup criteria at the time (1989). The location on Ravenswood Ave. has since become the site of a 36 unit condominium project.