simular... the ones for chickens and rabbits only has a pin.. you pull it back, push the button and the pin in the front shoots out. I believe the one for pigs and other larger animals shoot bullet like pellets.
https://www.siepmann.net/Kaninchen_Betäubungsgerät_DICK.html
https://www.siepmann.net/Kaninchen_Betäubungsgerät_DICK.html