Divine Angel said:

Nowadays one can 3D print a weapon with instructions from the internet. Most pf them are probably pretty flimsy, but I have heard of ones capable of firing bullets.

Yep it’s relatively easy to do. If I wanted to do it, I’d use a steel barrel machined to take the round and print the rest of it with a particular filament I’ve used which is incredibly strong.
I doubt it’d fall apart anytime soon though of course it wouldn’t last as long as the real thing.