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Don't worry too much about length, it's the ID that is more important. And people never buy AEG springs based upon length, so there isn't any information our there for that. Is just something you'll have to try out, buy a spring based upon rating (most are in meters per second, 1m x 3.3 to get the feet per second......... an SP100 spring will get you around 330fps, etc.)
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