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I fell in love with the G&G ARP9 as soon as I first layed my hands on it. From the snappy trigger response, to the sharp crack from the amplifier, and the easily manoeverable size, it felt almost perfect. But it did have a flaw...
The battery compartment in the stock was barely large enough to house the mosfet and a 1000Mah li-po battery. A few aftermarket designs for a stock extender had already been released, but I wanted one that would work perfectly. Thus this stock extension came into existance!
Now I can fit a much better selection of batteries and I no longer experience stock rattle as it does a superb job of stabilizing it.