Shootingropes this has been my main shooter for 2 full season so has had ALOT of paint, i would estimate 150 boxes through it at tournament and practice, ive taken good care of it and serviced it regulary. Never had to change an oring on it yet. just gave it a full service before putting it up for sale. its had no upgrades to it all bone stock. as far as your tank pressure i belive 850psi output (high pressure) is fine to use on it you just wont get the efficency out of it. ive used the ninja slp reg (300psi) on it and it and notice i got alot better efficency from it. hope this answers your questions