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yes everything's stock. when i took it apart last time i did see some light marking on the piston as you've said. what would you suggest i should do to prevent that from happening to the new one if i replace it?

7.4v 2600mAh 20c LiPo

Hello, I have a Specna arms SA-BO3 and my piston seems to jam in the outward position (when the spring is fully compressed) only way i found to fix my problem temporarily is to loosen the bolt that holds the spring in. not ideal as its now less powerful. any suggestions. i have stripped and...