is whether or not it will actually fire a bullet without exploding in one’s hand.
given that they've used steel barrel and chambers - yeah no reason at all why it shouldn't fire.
Were you to fire afew shot in succession you would probably risk melting from the heat - but can't see any other serious issues.

Except the fact that outside of america, handguns have only one purpose: shooting people.
In america I suspect they're a sort of teddy bear substitute :-)
Hell they're even a lynnrd skynnrd song that states 'handguns ain't got no use but killing'.
And before we get into a slanging match - americans will NEVER understand the rest of the world's attitude to gun and we in the rest of the world will NEVER understand america's attitude to them.

So every 3d printed gun thread will naturally be in two completely seperate pieces.

The worrying thing about the new namura ais that it uses 22 long cartridges. Pretty much the only cartridge used for firearms in the uk and as such the one it would be potentially possible for a non-firearms certificate holder to get their hands on.

And for once and for all printing a plastic gun is an UNSKILLED job. making agun with a lathe isa SKILLED job. There is no comparison.