have you set the hopup on to lift heavier bbs? Fps will drop as more hop is applied. That is normal.
Spring is already compressed when installed. Springs also don't magically lose their springiness by staying compressed, otherwise you'd see cars driving around collapsed completely on the bump stops of the dampeners. They lose springiness by cycling.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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