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You just ran into the problem with PDI springs. Measure the length of it please?
I recommend the Prometheus SP springs, they are rated in meters per second and are very good. I have a 110SP in one of my MP5s and it sits around 355fps with 0.20g BBs. And those springs are very easy to buy in Canada. When installing, make sure the end with the tighter coils goes to the spring guide, otherwise you'll lose 20-30fps.
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