Springs will sometimes take a set when first used, however, after that they do not take a further set in normal use no matter how long they sit in a compressed state. Regardless of the number of years.
It's certainly advise able to have it checked out, but if it was safe to fire the last time, it'll be safe now as long as it's not seen corrosion during the intervening years. Of course, if it's a collector grade gun, you might want to think twice about firing it.
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