Finally, I just realized something . If Megatron, as the MP-2 was to fit with Optimus Prime in robot mode, it would be a good thing. Indeed in Walther P38 mode ( the gun ) it would be at least twice bigger than a hand size real P38 so I would't stand for a menace to US laws, it would be just 2/1 replica, a big toy
Anyway, I would buy the Takara version