I don’t have any experience but I would think that milling would be safer that filament printing. You can get your own small milling machine at a pretty affordable price tag. And you can mill anything. https://ghostgunner.net

👀 curious to know myself

No worries. Let me know your experience if you buy one.

https://ctrlpew.com/the-complete-getting-started-guide/. They are reasonably safe. The Orca ar15 platform can handle full auto firing rates. The FGC-9 mk2 is an absolute tack driver and sees actual combat use in Myanmar