Does anybody know of a pcp that uses a modified stock that doubles as a carbon fiber air resevior, not a bottle shoulder stock but an actual full stock that is lined like a carbon fiber tank?
Not likely to find one in this generation because all high pressure vessels are born with a death sentence upon them. They can only be filled for a certain number of years and then they must be retired. Nobody wants to buy an airgun with a death sentence placed upon it at it's birth.
No. High-pressure pretty much requires a cylinder of some sort. Not saying an irregular-shaped air housing couldn't be done but the engineering involved not to mention regulations would most most likely doom it.