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Just a quick note to add.
In my more recent builds, I've found that almost all M120 ~equivalent springs (madbull, PPA, etc...) have been resulting in velocities in excess of 400fps (i.e. 410-430). Might be just the combination of my builds, my chrony, etc... but it is what it is.
I've liked the madbull and PPA springs that I've used recently, but they've only been used for a season, so we'll see how they hold up. A Systema M100SS that I've had in an M4 for 2 seasons still shoots the same FPS since day one (est 27K-30K rnds).
If your local field limits are 400fps with 0.20g bbs...you may want to err on the low side (i.e. M110 spring or cut a couple of coils off a M120) and you should get your rifle chronied to be sure.
Not sure if everyone takes the field limits seriously, but I know that some do.
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