To add on to this it is a bottle of some sorts that usually is made of metal of fiberglass, which can be placed under pressure. So in a way it is a mini version of a air compressor, but with a set amount of air in it.mav3r1ck said:High Pressure Air. It is usually from an external rig. Pretty much a compressed air tank.
People have tried to rig HPA for pistols, not that hard but it would be a pain to have a reg set up for that...mav3r1ck said:I haven't but there is an idea that I just might try! It would be no different in feeling than running a pistol lanyard!!! You Sir, are a brilliant man!!! (When I get the money I will be modding a mag for my M9 PTP and will let you know how it turns out)