I highly recommend that firing pin springs be stored with the least amount of compression on them as you can get.
If you can accurately measure spring pressure you will find over time (years) that springs will loose lbs of resistance. Maybe not enough to cause misfires.
I have change out springs that have been compressed or shortened by as much as 3/16" in a two year time frame.
I believe you will find that most steels used in the firearms industry will take a set if left in a bent or compressed state.
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