Strange that they look so alike, but that Airsporter is something different, l would like to know it works, with the tube being under the barrel.
Mick I'm guessing the loading must be automatic, perhaps with starting to close the cocking lever pushing a ball into the loading tap (a bit like the Haenel 28R repeater loads balls), then the tap rotates 45 degrees as the lever clicks shut, or something like it?
Vintage Airguns Gallery
..Above link posted with permission from Gareth W-B In British slang an anorak is a person who has a very strong interest in niche subjects.