well i think ill choose B but i just dont want to have to have it be open while i fuel the chamber. it brings back terrible memories of rushing the shot due to escaping gas while screwing it back on. maybe have it open while venting and loading, then when i fuel have it closed.

just added the pictures in hope that they can get what im trying to say across.

Yeah the 90psi ones are just fine. they dont even reach 90 most the time because its just a quick burst of air.

I am finally deciding to build my biggest and baddest cannon yet, which may not be so big and bad to you guys. :oops: I want to use a fan/electric ignition/propane meter in this cannon. its a big step up from the spray and pray cannon which ive built many times before. i understand how to build most...