The grip screw does indeed look like an inspector mark associated with Simson--Ed Tinker can probably post similar looking eagles from these guns.
The ejector looks like it might be an eagle over Jt2, a mark of a Heeres Zeugamt based in Ingolstadt. (An Erfurt ejector stamp would be stamped on its side, and much nearer the middle of the part.)
--Dwight
ps Ed, you beat me by a minute!
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