While it has nothing to do with this thread (and I have no problem with that).... I would suggest you PM Gippeto and ask him about the HiPac, he is familiar with them.... They screw into a 2240, replacing the Co2 cartridge with an HPA cylinder with Foster fill fitting.... You can then fill from a stirrup pump (or SCUBA tank).... If you don't have your PAL, you will have to do some experimenting to keep your 2240 under 500 fps....

Bob