?

The lack of air capacity is my only issue I have with the WC. I love my Compact but when engaged in a sustained fire fight with a flock of sparrows in the brush it's a pain in arse to have to stop blowing them up to refill after 4 mags. I would suspect the .30 cal to give about the same shot count per fill? I have only one bottle gun and that fugly bottle as you call it chuck is an all day lollypop when it comes to putting lead downrange. But most people probably don't get into gun fights with their PCPs so I will deal with it. 
 
The only thing I like about the large bottle on my Crown is the high shot count. I can take the gun to the farms now and leave the tank at home.

Though I do prefer an air cylinder for looks alone. The Crown would be that much better if it had say an air cylinder that was twice as long as the bottle but half the diameter.....then lengthen the forestock of course......that would be wicked!!


 
For current owners of .25 and lower caliber wildcats, I would guess it would be possible to add the regulator on current models, as long as the tubes are almost the same? Might have to drill a new hole in the tube, and block the current went hole? Would probably be nice for those who like to thinker and adjust allot.

Regarding the bottle on the crown: As far as I know the threads are the same as the tubes fitted on royal 300, and bobcat guns. The later model royal also used the carbonfiber bottle. So a bobcat tube can probably be screwed on the crown, but I guess it would look ugly with the standard stock.

Edit: The bobcat tube will actually not fit on a crown, with original stock (no one would probably consider it anyway:)). The tube is thinner than the bottle, but the neck on the bottle is thinner than the tube. There is not enough room on the stock to fit the wider diameter tube.