You can allways charge the batt for an hour then fire in semi to reset the spring. Another way (depending on AEG) is to remove moter and grip. Pull firmly on the antireversal latch and the gearbox will spin in reverse. Be very carefull not to damage the small reverse spring on the latch.
Its always a good idea to fire you gun in semi after using full auto before storage. Sometimes in full auto the piston can stop at a compressed position. Fire in semi allows the gears and piston to go back to the uncompressed position.
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