I was of the impressions that 1920 carbines were generally made up from left over parts from WW1 and fell into the grouping of the 1920 commercials. The long frame may have been from a Navy or Swiss luger, the rest just beeing cobbled together. Many of these 1920 carbines possess their own unique features. I don't believe that they were in any way "faked" although later "mechanics" could have made some.
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