Lol Silverthorn ... i just found out that you asked the exact same question one year ago :
http://www.airsoftcanada.com/showthread.php?t=100034
(still can't figure out why chromium is more effective at finding what I need here that the ASC search engine itself (but well, any SQL database engine seem to be like that so...))
If only I had a chrony... I could ... maybe... try the stock spring of my Tar-21, that make it shoot like 260-280ish (and that make me sad...)
Silverthorn, did you know what is the M rating or the stock spring you use now in your 97B to make it shoot 380-385 ?