Good info Bob

The regulator add on module thought was for precision target. 6 fpe or less. But if I can get my design down it would be easy to just increase the volume in the plenum (within limits...not bigbore) by increasing the length of the block I suppose. I'm going to guess that a paintball adapter socket is 7/8" dia and 1" long that would give me 38cc in the socket and an additional 38cc for every inch of cavity in the block.

And I definitely had the Mrod trigger in mind. They fit well with the modular concept. But....thats if crosman is playing along