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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.