Just some background

[Londonshooter]

For shotgunners this is truly a "forgotten weapon" and pre-dates what we often assume to be the first breechloading cartridge sporting shotgun by > 50 years. A fascinating history of the Swiss genius Pauly and his gun as retold by Ian.

 

[cam1936]

I don't see any sort of locking lugs or block, how did it lock up? Very innovative.