My 6 year old son is begging me for a go with my air pistol (Twinmaster). I'm keen for him to have a go but it's a bit big and unweildy for his small hands. I'm looking for a suggestion for a gun that he could use (under close supervision, of course) for target shooting.

The perfect gun would be:
- small
- light
- cheap
- accurate
- easy to cock and load (perhaps CO2?)
- not a replica of a firearm

Ideas? I had a Webley Junior when I was a boy and it ticked most of those boxes (apart from the "accurate" one IIRC) - but they seem to have become collectors' items.

U.