I don't understand why you can't buy a .177 air pistol to use for rapid target shooting...?
You can get a lot that are magazine fed with the power source in the magazine, they can even look realistic without you needing a defence against the VCRA. Only difference is the ammo is more expensive, metal, and there's no hop - though if you're plinking targets at short range, hop is pretty useless anyway.
The only reasons I can think of to go airsoft gun instead of air gun, is:
- There are clubs that do airsoft pistol shooting, as Dave mentioned, so you could join one of those if you went for an airsoft pistol
- The ricochets would be a lot less dangerous from an airsoft pistol.
If you're just going to do it at home then why not just get something like this?
http://www.airgundepot.com/sig-sauer-x-five-p226-full-metal-bb-pistol.html
Obviously you'd need to find a local air gun retailer that stocks that kind of stuff first, since it all has to be done face to face these days, if I remember right, but that'd be a lot simpler, cheaper, and easier, than having to play 3 airsoft games to get UKARA before buying anything.