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Unsure Cyma spring guides but if it doesn't have any bearings the Lonex spring guide is going to increase your FPS and allow for additional compression of the spring.
If the spring guide fits securely inside the tabs of the mechbox then it is the correct spring guide. You should know immediately if it flies out or you can't close the mechbox that it is the wrong type.
If the piston head has any washers or bearings secured inside the piston, you can safely remove it and it will drop your FPS.
What is your target FPS?
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