Small calibre
 

Here 2 calibre reduction kits for the Swiss Parabellum I own.

4mm. Uses primers to shoot a 4mm lead ball

http://i1238.photobucket.com/albums/...p/IMGP0070.jpg

6mm. fits 22lr, but haven't tried to shoot yet.

http://i1238.photobucket.com/albums/...p/IMGP0068.jpg

in that case, must be .22LR center fire - quite a rare cartridge

Alexander

No, standard rim fire.

The dummy cartridge case transform the centre hit to a rim one.

http://i1238.photobucket.com/albums/...p/IMGP0079.jpg

Very intersting solution - must be a rare sub calibre device - I just saw that Görtz and Sturgess show one in the 3rd volume of their Luger book (page1357) - but I never saw one in reality

Most likely 4mm caliber...

Yes, the top one is 4 mm, a lead 4 mm ball propelled by a primer. to shoot at 10 m.
Here is the ammunition and primers for the kit

http://i1238.photobucket.com/albums/...p/IMGP0001.jpg

The second set is 6mm, rim percussion, to shoot at 50 m.
The .22 lr cartridge fits perfectly.