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5 M100s from 5 different companies will all be different fps.
Especially these days, you have no idea what kind of gun the mfg tested the spring on, or if it was tested at all.
Back in the day we had a guy record the fps on a bunch of different springs and what we got from those companies was very consistent.
Mispackaged springs are always a risk, but even worse are the M120s that shoot 470fps because they were tested on an overvolumed g&p lol
It is what it is, either cut coils off, short stroke the piston, both, or just get a new spring.
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