Is this the same Systema that makes garbage 6.04mm tightbores and puts crap motors in $2400 guns?
Yeah I don't buy anything they say anymore.
Manufacturers can be way off on their ratings, higher quality manufacturers are usually rpetty close, ehobbyasia is just freaking awful they're usually out by a good 100fps
Refer to this chart for FPS ratings on springs;
http://www.airsoftcanada.com/SpringChart.php