Before this gets personal and people's feelers get hurt, lets talk about the safety and realities of the Polarstar HPA setup in its' own thread, where it won't derail people's events.
Argument: HPA can be tuned to a higher fps and makes cheating easier and is unsafe.
Counter-Argument: The Polarstar HPA engine has a device that is internal and caps the weapon at 405fps. To go higher you must disassemble the gun and put a new piece in, that does not come stock with the gun.
This is identical in mechanics to someone buying a hot spring and swapping it in one of the many guns that allow a quick spring swap