I tried a rifle version of this a couple of years ago, it was offered to me for £200, but the fill adaptor was missing and there was an internal air leak.
The action works on the revolver principle and it had probably the heaviest/worst trigger I've ever used.
I tried to obtain some seals and a filling adaptor from the states, but didn't have any luck.
One interesting fact, I was told, it could be filled with Co2 instead of compressed air.
Although to look at and handle, I preferred it to a Career, I didn't buy it.
Ben