[mothballed]

They're pretty damn reliable if you either use a hybrid model (FGC-9) where the barrel is "explosion proof pipe" from china that is then electrically machined (easy with 3d printed mandrel) to form a nice rifled barrel.

Or you just 3d print the "receiver" for something like an Ar-15, which isn't load bearing. If you use the right materials and the beefier designs it will lats hundreds to thousands of rounds. The rest of the parts can be bought through the mails unregulated.