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The "3D printed gun" trope was taken back I think. They now claim that he only 3D printed the silencer. Some gun lobbyist probably donated a wad of cash.
That wasn't a 3D printed silencer in the video.
If it was, that material is way stronger than anything I've worked with.
Nowadays, you can print guns out of basic PLA. At least in .22 caliber, I don't know about anything larger, though I do know 3d printed Glock frames are definitely a thing. A 3d printed suppressor is definitely feasible, as I've seen at least 1 design for PETG.
Now, as to whether or not that's what can be seen in the video? Who knows. I certainly can't tell.
So I'm not into firearms. Guns aren't reaaally my thing. However, I imagine with quality material you need a larger silencer for a larger caliber, or a modified design to rapidly reduce pressure. It stands to reason then that with a design less capable of withstanding that pressure, you must then compensate with a larger design even at lower calibers. Someone correct me if I'm wrong, though this then stands to reason that even a .22 would need a much larger design, or a modified design which would by nature increase noise via gas release.
That said, a silencer doesn't silence, it reduces. If he was as prepared as we think he was, he'd know that.