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You can 3D print a gun you can use once.

Where are you going to get the bullets from? Or for a shotgun, where is the powder from, the pellets etc.

I live in the UK, I quite like clay pigeon shooting, would it be a shock to you that American mass shootings basically aren't news worthy anymore unless they are more than 2 dozen people now?

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That's not correct, if you want a rifled barrel, you do need to electro-machine it, and you might want some airsoft parts, but everything else is bolts and printed parts.

What? Unless things have improved a lot since I last checked all the designs for fully 3D printed guns I could find were one used affairs.

3D printed firearms have drastically improved in the last couple years. Here is a 3D printed glock https://ctrlpew.com/freemans-g26-3d-printable-glock-frame-di..., there are also 3D printed ar/ak lowers.

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