Gerben,
Can you provide the page number for the Dutch Luger quote? Does it seem to you that they mean there is a small M -and- the GS mark?
Does anyone have contact information for either Martens or de Vries?
As far as replacing receivers is concerned, I can't imagine why that would be done on any regular basis, it is the barrels which deteriorate. Also, according to Martns & de Vries, the GS did not manufacture receivers, so they would have to find them somewhere, scavenge them from other guns, or buy them new from Germany.
--Dwight
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