I am running PDI springs and so are a bunch of other people that play with me, they all are constistant and pretty much hit the same fps between guns *other things of course come into play*
One question though, why such a heavy spring, 190% is gonna fricking hurt. the 150% puts out 390fps on .20g
btw the spring should become more like the picture when compressed. when you put it into the mech box take note, it should do that...