Yes pzjgr, exactly what I am saying. I need to clarify a bit- when I say not made in a Concentration Camp, I don't mean not made by Concentration Camp inmates. During my research I found the layout for the Mathausen subcamp of Gusen II- this is where the Steyr Barracks were located (a large facility). These barracks supplied the workers for the underground facilities there. There were no assembly areas in the Steyr barracks from the plat maps I looked at.
Also, in arial views I saw no rifle ranges for test firing guns (you can't do that underground- well, you can but it's a waste of valuable real estate). Also, read this statement from our book:
From Page 25:
The Pole Emil Samek has given a detailed report about efforts to slow down production in the Steyr plant at Gusen: “I worked there from spring 1943 to the liberation on May 5, 1945, mostly as a setter . . . This gave me many opportunities for sabotage by setting the devices incorrectly, and other setters did the same thing. However, we soon stopped doing it, for it would have been easy to trace such acts. . . . Only during the final inspection in a separate shop were there greater opportunities for passing larger numbers of improperly dimensioned parts for the final montage, which was done outside the plant, or for putting the right parts on a junk pile to be scrapped. I only worked on the final inspection for a few months, but I know that organized sabotage took place there. . .
However, a 100 percent sabotage was not possible until after the installation of a tempering facility in our plant.” In this endeavor young Poles acted so conspiratorially that Samek did not learn until after the war “what excellent work was done” there. The improper hardening of some parts of a gun sufficed to make the gun fail after a short period of use. \Samek’s compatriot StanisBaw Nogaj has mentioned Józef Ladowski as the organizer of this very effective sabotage in the heat-treating shop, and he has also reported about Poles who gave out damaged implements in the toolhouse. During the nightshift, other Poles substituted defective parts for good ones and sent them to the main plant in Steyr. The good parts were taken back to the plant and added to the production lists for a second time."
Keep in mind that inmates had no idea where parts were going when they left the plant, they only assumed that these parts were shipped to Steyr Austria.
Also, the Steyr plant in Steyr Austria was heavily bombed in February 1945 and finished off in April of 1945. This bombing of Steyr assets was one reason the barrel plant was moved to Gusen in 1944, to protect the valuable machinery that made the parts (as you state).