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I don't get why the RD Aerial doesn't use the HG's gimmick it's a lot more efficient.
Also it's quite a shame that none of the Aerial's toys have been able to make the shield work without a backing piece like this, especially considering it's the main gimmick.
It really highlights the difference between experienced mechanical/toy designers like Ebikawa or Katoki from JNTHED who is coming from a less functional artistic background.