Weiss and RWS
Karl Erhard Wei� and the Rheinisch- Westfälische Sprengstoff- AG got patents in 1922 and 1923 and seems to be the first with the idea of a subcalibre barrel for the Luger.
RWS made conversion units for the privat market. The units got numbers. This one has no. 6 which indicate: calibre 4mm M20 for a Luger in calibre 7,65 with 4 3/4" barrel.
Other numbers matched for example the Navy or LP08 barrel length and calibres.
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