[Bloody Sam Roberts]

it can. And did.

I am dubious. If a 5.56 round is fired from a full on steel barrel made for .223 rounds will fail. Eventually or straight away.

How can a barrel made from polymers on a 3D printer withstand those kind of pressures? My head don't bend enough to get wrapped around that kinda thing.

[JRandomFreeper]

The video shows the pistol firing a standard .380 from the plastic barrel.

This, by the way, was an engineering proof-of-concept, not a finished product. V1.0, in other words, not even beta test.

And the gooberment is trying to shut it down. And failing.

Also, there have been plastic cartridge cases made and used before. Not with 3-D printers, way back before then.

/johnny