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I've had a few PDI 150% springs in my hands over the years, the first was 350fps in my MP5, others went all the way up to 425fps. Different lengths (I was the one that sorted that out) and materials, as in thinner brownish wire on the 350fps one at 6 3/8" long, and thicker black wire up to 7" long for another. The rest fell in between the two.
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