I have the new version m16a3 and love it. It performs very well and I have had no problems with it. I havnt really upgraded it yet internally except a tight bore...hadnt really seen the need for it with all the new features.
I had the same problem mentioned in fitting a large mah 9.6v battery in the full stock. I removed the tabs inside the stock still with no luck. I finally just installed a CA crane stock and 9.6v 4200mah crane battery.
And yes I can verify...the new versions (2006-2007) have steel gears, steel bushings, upgraded 16 gauge wiring, and the turbo 3000 motor.
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