Yep I 've seen the video. Pretty impressive.
I don't know if I 'd call that a pistol though :-) Maybe it started out as a pistol, but besides the long barrel which is ok, it seems to have a long forearm too (or is that where the high pressure air is stored?). That would make it a rifle.
Congrats on your monster .50 Dragon Slayer Tim! 300+fpe is as much power as a 357 Magnum except your gun will be virtually recoiless! Is it a DAQ? or modified by Jeff? I think you told me it's a product of both Mr. Quackenbush and J?
I 'm still waiting for my lowly 60+fpe PCP to be shipped :( The guy is waiting for a part..