My m8 has just ordered a Karni from here...check the shipping rates first though..
IMHO you're better off buying over here if you can...
A pump cocker would be a better bet though...
The built in reg (for velocity adjustment) is a bit naff, making it hard to get consistent shot to shot accuracy. A few owners have swapped the front gas through grip for a good inline reg (Dye hyper or CP), and run the internal reg fully open. This gets the Khaos shooting much better, and for some reason makes it a lot quieter too.