Hi Rich, I was assuming that the parts mentioned (add ejector)were probably made up of a, "best available" spring steel, maybe 50% or better in carbon at the time. And, as I really don't know what was available at the turn of the century, it is an assumption on my part.. Now the Nazi era pistols might be a whole nother deal?? As advanced metallurgy was on the fast track by then.. In working more and more on complete lugers and getting up close and personal with so many associated parts, I'm constantly amazed at how soft and bendable most parts are??... Example, bent takedown levers, bent or deformed sideplates, sprung receivers, etc... Pretty interesting stuff... As far as specifications go, If we could find any, I would be willing to bet it would spec the cheapest steel possible to fulfill the job it was designed for...Materials cost is the first place the accountants would check... I'm betting the majority of the Luger parts are just plain 1010 or 1018 low carbon steel...
.. best to all, til...lat'r....GT