Cork Guns and Pop Guns - Air guns remembered

I'm really looking for help on this one. I have many early memories of a child of being presented with a cork gun or pop gun for my shooting pleasure. These shaped like a rifle or Daisy BB gun. However the bore end was left a large opening where corks (much like wine corks) could be pushed in. The rifle was cocked and BANG, the cork zipped forward, while the satisfying bang or POP rang out. Many of these rifles fastened the cork to the rifle with a lenght of lightweight cord, but it did not seem to remain connected long.

I'm guessing that these devices were indeed airguns, and wondering if anyone can confirm this for me.

These rifles seemed quite harmless (I assume the cork was moving 30Fps or so) and we were allowed to play with them inside, an area where bb guns were never allowed.

Thanks for reading this.

Loneshooter