You would need solid metal bushings and a shim job. That would make the gears cycle perfectly with an 8.4 or a 9.6. The lipo would be excessive with those improvements causing over spin. I just love the insane rof and quick trigger action. Where lipo's are so hot running though, a replacement of the trigger contacts may be necessary from arcing... although like I said no problems yet and I always have the gun apart to check! A mosfet is also a quick sol'n to that!
AK-47, G&G SCAR-L,
TM P90, APS ASR101 M4A1, TSD VSR-10, SIG SAUER P226 X-Five...