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Could be a 130% spring that puts out 420fps too. Lol, seriously, I've had a handful of PDI 150% springs come across my bench, they measured in length anywhere from 6 3/8" long to 7" long, and put out between 350fps and 425fps. Those were for the springs I was able to compress enough to get the mechbox closed, there were two that I wasn't able to, and was obvious if I did get it in, the V2 mechbox would explode within the first few hundred rounds.
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