This will probably spillover to more countries soon and will be a major challenge for Western democracies as well. Almost impossible to police and Europeans might start feeling unsafe and willing to own some as well for self defence... 

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 Dont they melt when fired ? 

 3D-printed guns can be made from various materials, such as plastics and metals, and their durability depends on the material and design.

You can check out some designs here:
https://cariocaworks.com