Well proper gun handling procedure would be to immediately make sure the safety's on, check if it's loaded and whether there's a round in the chamber. Nitta didn't do any of that, so I can only conclude that he's received no training at all. Given Japanese society, it's quite possible that none of them has even seen a real gun before.
Of course, it's also possible that the author's knowledge of guns and how to use them comes from Hollywood.
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