I´d say that there fills the bill. Artemis CP-2 to me, Snowpeak CP-2 to you. Comes as seen, yep with a pistol and carbine barrel both and a shoulder stock.
As above this is a CO2 gun though why some smart porting will make it more than capable enough for what you ask (read - use a common drill bit).
I bought mine with the sole intent of creating what was not, a PCP gun.
Uhu. Kept the basic CP-2, just cut the tank off and made me a 300cc one to keep the remains, for lack of better words, as a very light and rugged carbine.
That there is of just shy of 90J actually, which is more than ample.
I second what the others say though, a PCP pistol (or a souped up CO2 ditto) is loud. If a so called moderator is installed that just brings that the pistol in case grows as far as length... so when does it stop being a normal "pistol" in that regard?
As in the last pic there though, that thing is as light and nimble as you could ever ask. Accurate too. As it stands there it´ll put the lights out for any pest within 100 meters with ease.
This though as modified into a PCP. As a ported CO2.. say 30 meters.