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The G4/E720 is designed to be easily converted between nitro and electric, the X50 was designed initially as a nitro with a separate electric version following some time afterwards.
I've build both the X50 and the E720 and there is not a lot of similarity between them.
You can recognise the origins of the X50 in the older Raptor models even though it is of course a considerable step forward from there. The G4/E720 doesn't really have much similarity to any of the previous models.
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