This is a cost-effective electric winding magazine for M14 lovers, now available at RSOV.com..."M14 1000 rds electrical-feed double magazine comes with re-chargeable battery and battery charger. Battery can be easily accessed by removing the dummy magazine floor plate. The spring winding can be activated by the local push button at the back of the dummy magazine and the copper fake bullets magazine top can be slide opened for easy bb filling."

Now, if they just make more of these for M16/M4 and AK series...