there are exceptions to every rule
Hildegarde
There are private fire departments. They are owned by companies that own industrial facilities with high fire risk, that need immediate response, such as oil refineries, chemical plants, and and factories.
But you're right that there aren't private fire companies to serve anyone on demand. There are no manned fire trucks in LA waiting for a high enough bidder to respond to the fire.
there are plastic 3D printed guns where the barrel is plastic. Its springs and the firing pin that would need to be metal. When your gun only needs to work for a dozen shots with subsonic ammunition, 3D printed plastic can be fine.
The shizo abe deleter was also was also homemade from weak materials. That's enough when you only intend to use the gun once.
There are real processionally manufactured guns made mostly from plastic like the glock, and there are new strong printable plastics. 3D printed guns are feasible, people make them as a hobby.
This thread is a year old why are you here?