I think science fiction and news morph together too often.
I heard the gun story was exaggerated, while you can make something that looks like a gun to be able to fire a bullet from one is something else, from my understanding the gun would need at the least a metallic firing pin.
Your job will be safe for a while yet Russel, the real place of 3d printers is to help make the moulds for casting.
I could see years ago the need for casting some parts but didn’t have the resources to do so, your parts look good and I wish you every success with it.
Something else to consider is replica CZ hubs if you think you can cast them with the needed strength, the magnesium originals often suffer from old age and are risky to use.