
It opens like a shotgun

The left barrel is chambered for a 6mm <spit> Flobert cartridge (~.22), the left for a 9mm rimfire shot cartridge. Another new one on me and something that you can still purchase. Oh joy!
Shot the .22 barrel into the pool but couldn't find the damn projectile. Maybe I'll try again later.
Anyway, the gentle Germans would use these to wipe out jews pests in their gardens. Not really long range... maybe 20 yards? A bit more perhaps?
Utterly useless except as a thing that one can post about on a forum.