With fake ammo, obviously.
The Kuratas also comes with the most ominous feature ever: the Smile Trigger, which is exactly what it sounds like -- when the pilot grins, the mecha unleashes 6000 rounds per minute of bullet-shaped retribution. Tell us that's not designed specifically to court supervillains.
Because humongous functional mecha are expensive as s**t, they've built precisely one so far (and put it on sale at Amazon Japan, so hopefully it at least qualifies for free shipping). But eventually, there might be more -- and they might have competition. America has also noticed that life isn't nearly as awesome as it could be, so a U.S.-based giant robot company named MegaBots, and the company responsible for Kuratas, have both agreed to fight with their mechs, Gundam style. Here's what the good old U.S. of A. is bringing to the fray: