These guns aren’t shooting real ammo, but the guy’s clearly trying to make a point: gun laws don’t prevent people from acquiring firearms, even if they have to make them, and the technology to easily manufacture firearms at home is marching on.
Imura2011’s got a website that hosts his and others’ 3D printer plans as well as guides to make rudimentary firearms with wood. The manually-charged revolver is pretty clever, and looks like it could handle quite a bit more abuse than the original Liberator pistol.
Not particularly concealable, though.
For more videos of 3D-printed guns in Japan, head over to his YouTube channel.