In any cases, and correct me if I'm wrong, Echo1 guns are not meant to use such springs... Unless your intentions were to hang that gun on your wall, I don't know many fields allowing +400 fps guns... It's kind of obvious that you had to swap the spring for a less hot one. Besides, using a lipo and keeping that spring (correct me again) can prematurely destroy your gun as it is an entry level gun... Personnaly, the first I would have done is to change the spring for let's say somthing like a m110... and than, try to use it...
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