patrykj26

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 rebuilt the gearbox nothing looked damaged. piston moves freely in the cylinder. gun jams when in fully auto or quick single fire.