I've got an Eclipse Ultra. The dual spring is more a function of getting the K Factor that you need in the length available. (Its gotta hold the slide and barrel together to get the bullet out and the pressure down before the link unlocks the barrell and slide.)Doesn't have that much to do with recoil. The Eclipse has a steel frame and that extra weight has more to do with recoil reduction than the spring. No hydraulics or anything in my pistol, just a standard guide rod.
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