Tell us about yourself!
Sorry but you are incorrect, it is NOT powered by air pressure. Rather it's powered by rapid expansion of the Gases produced by ignition.
Mate they cost about $1.00aud from EBay
Me To, pretty sure FPS is an international standard pertaining to any Firearm. I live in Australia ( A Metric Country ) and its still FPS.
Australia is Metric and here its FPS.