People in the EU have been constructing their own ammunition (including the now deceased developer of the FGC-9) using inert rounds and nailgun blanks or unregu

People in the EU have been constructing their own ammunition (including the now deceased developer of the FGC-9) using inert rounds and nailgun blanks or unregulated blank ammo as a source of primer material and powder. There's also the Plasma Pump project which apparently is going to eventually become semiauto, fires printed+cast caseless rounds using an electric high voltage igniter (think: arc lighter), and the firearm itself is fully printed.