Ya i know, unfortunately the airsoft equivalent does not exist at all! My only hope to get this gun running again is to try a real steel part. Ghaa what a head ache!
With regards to the stiffness issue, I figure it should be fine to run it in the gun because all the spring does is reset the hammer. It has nothing involved with hitting the valve.
EDIT: Holy crap MultipleParadox, thanks for the link, they actually list that parts, hope they have them in.
RE-EDIT back to square 1, they dont have the part either
P.S. Are there any ASC members that reside stateside that would like to help out a guy in need? I can compensate you fairly for your efforts.